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  • Santoso, Agus  (66)
  • 2015-2019  (66)
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  • 2015-2019  (66)
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  • 1
    Online Resource
    Online Resource
    Pantropical climate interactions
    American Association for the Advancement of Science (AAAS) ; 2019
    In:  Science Vol. 363, No. 6430 ( 2019-03)
    Details
    In: Science, American Association for the Advancement of Science (AAAS), Vol. 363, No. 6430 ( 2019-03)
    Abstract: The El Niño–Southern Oscillation (ENSO), which originates in the Pacific, is the strongest and most well-known mode of tropical climate variability. Its reach is global, and it can force climate variations of the tropical Atlantic and Indian Oceans by perturbing the global atmospheric circulation. Less appreciated is how the tropical Atlantic and Indian Oceans affect the Pacific. Especially noteworthy is the multidecadal Atlantic warming that began in the late 1990s, because recent research suggests that it has influenced Indo-Pacific climate, the character of the ENSO cycle, and the hiatus in global surface warming. Discovery of these pantropical interactions provides a pathway forward for improving predictions of climate variability in the current climate and for refining projections of future climate under different anthropogenic forcing scenarios.
    Type of Medium: Online Resource
    ISSN: 0036-8075 , 1095-9203
    URL: Article
    DOI: 10.1126/science.aav4236
    RVK:
    TA 1000
    RVK:
    WA 15000
    Language: English
    Publisher: American Association for the Advancement of Science (AAAS)
    Publication Date: 2019
    detail.hit.zdb_id: 128410-1
    detail.hit.zdb_id: 2066996-3
    detail.hit.zdb_id: 2060783-0
    SSG: 11
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  • 2
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    Online Resource
    Assessing the Impact of Model Biases on the Projected Increase in Frequency of Extreme Positive Indian Ocean Dipole Events
    American Meteorological Society ; 2017
    In:  Journal of Climate Vol. 30, No. 8 ( 2017-04), p. 2757-2767
    Details
    In: Journal of Climate, American Meteorological Society, Vol. 30, No. 8 ( 2017-04), p. 2757-2767
    Abstract: For many generations, models simulate an Indian Ocean dipole (IOD) that is overly large in amplitude. The possible impact of this systematic bias on climate projections, including a projected frequency increase in extreme positive IOD (pIOD) using a rainfall-based definition, has attracted attention. In particular, a recent study suggests that the increased frequency is an artifact of the overly large IOD amplitude. In contrast, here the opposite is found. Through intermodel ensemble regressions, the present study shows that models producing a high frequency in the present-day climate generate a small future frequency increase. The frequency is associated with the mean equatorial west-minus-east sea surface temperature (SST) gradient: the greater the gradient, the greater the frequency because it is easier to shift convection to the west, which characterizes an extreme pIOD. A greater present-day gradient is associated with a present-day shallower thermocline, lower SSTs, and lower rainfall in the eastern equatorial Indian Ocean (EEIO). Because there is an inherent limit for a maximum rainfall reduction and for the impact on surface cooling by a shallowing of an already shallow mean EEIO thermocline, there is a smaller increase in frequency in models with a shallower present-day EEIO thermocline. Given that a bias of overly shallow EEIO thermocline and overly low EEIO SSTs and rainfall is common in models, the future frequency increase should be underestimated, opposite to an implied overestimation resulting from the overly large IOD amplitude bias. Therefore, correcting the projected frequency from a single bias, without considering other biases that are present, is not appropriate and should be avoided.
    Type of Medium: Online Resource
    ISSN: 0894-8755 , 1520-0442
    URL: Article
    DOI: 10.1175/JCLI-D-16-0509.1
    RVK:
    UA 4548
    Language: English
    Publisher: American Meteorological Society
    Publication Date: 2017
    detail.hit.zdb_id: 246750-1
    detail.hit.zdb_id: 2021723-7
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  • 3
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    Online Resource
    Ice–Atmosphere Feedbacks Dominate the Response of the Climate System to Drake Passage Closure
    American Meteorological Society ; 2017
    In:  Journal of Climate Vol. 30, No. 15 ( 2017-08), p. 5775-5790
    Details
    In: Journal of Climate, American Meteorological Society, Vol. 30, No. 15 ( 2017-08), p. 5775-5790
    Abstract: The response of the global climate system to Drake Passage (DP) closure is examined using a fully coupled ocean–atmosphere–ice model. Unlike most previous studies, a full three-dimensional atmospheric general circulation model is included with a complete hydrological cycle and a freely evolving wind field, as well as a coupled dynamic–thermodynamic sea ice module. Upon DP closure the initial response is found to be consistent with previous ocean-only and intermediate-complexity climate model studies, with an expansion and invigoration of the Antarctic meridional overturning, along with a slowdown in North Atlantic Deep Water (NADW) production. This results in a dominance of Southern Ocean poleward geostrophic flow and Antarctic sinking when DP is closed. However, within just a decade of DP closure, the increased southward heat transport has melted back a substantial fraction of Antarctic sea ice. At the same time the polar oceans warm by 4°–6°C on the zonal mean, and the maximum strength of the Southern Hemisphere westerlies weakens by ≃10%. These effects, not captured in models without ice and atmosphere feedbacks, combine to force Antarctic Bottom Water (AABW) to warm and freshen, to the point that this water mass becomes less dense than NADW. This leads to a marked contraction of the Antarctic overturning, allowing NADW to ventilate the abyssal ocean once more. Poleward heat transport settles back to very similar values as seen in the unperturbed DP open case. Yet remarkably, the equilibrium climate in the closed DP configuration retains a strong Southern Hemisphere warming, similar to past studies with no dynamic atmosphere. However, here it is ocean–atmosphere–ice feedbacks, primarily the ice-albedo feedback and partly the weakened midlatitude jet, not a vigorous southern sinking, which maintain the warm polar oceans. This demonstrates that DP closure can drive a hemisphere-scale warming with polar amplification, without the presence of any vigorous Southern Hemisphere overturning circulation. Indeed, DP closure leads to warming that is sufficient over the West Antarctic Ice Sheet region to inhibit ice-sheet growth. This highlights the importance of the DP gap, Antarctic sea ice, and the associated ice-albedo feedback in maintaining the present-day glacial state over Antarctica.
    Type of Medium: Online Resource
    ISSN: 0894-8755 , 1520-0442
    URL: Article
    URL: Article
    DOI: 10.1175/JCLI-D-15-0554.1
    DOI: 10.1175/JCLI-D-15-0554.s1
    RVK:
    UA 4548
    Language: English
    Publisher: American Meteorological Society
    Publication Date: 2017
    detail.hit.zdb_id: 246750-1
    detail.hit.zdb_id: 2021723-7
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  • 4
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    Dynamics and Predictability of El Niño–Southern Oscillation: An Australian Perspective on Progress and Challenges
    American Meteorological Society ; 2019
    In:  Bulletin of the American Meteorological Society Vol. 100, No. 3 ( 2019-03), p. 403-420
    Details
    In: Bulletin of the American Meteorological Society, American Meteorological Society, Vol. 100, No. 3 ( 2019-03), p. 403-420
    Abstract: El Niño and La Niña, the warm and cold phases of El Niño–Southern Oscillation (ENSO), cause significant year-to-year disruptions in global climate, including in the atmosphere, oceans, and cryosphere. Australia is one of the countries where its climate, including droughts and flooding rains, is highly sensitive to the temporal and spatial variations of ENSO. The dramatic impacts of ENSO on the environment, society, health, and economies worldwide make the application of reliable ENSO predictions a powerful way to manage risks and resources. An improved understanding of ENSO dynamics in a changing climate has the potential to lead to more accurate and reliable ENSO predictions by facilitating improved forecast systems. This motivated an Australian national workshop on ENSO dynamics and prediction that was held in Sydney, Australia, in November 2017. This workshop followed the aftermath of the 2015/16 extreme El Niño, which exhibited different characteristics to previous extreme El Niños and whose early evolution since 2014 was challenging to predict. This essay summarizes the collective workshop perspective on recent progress and challenges in understanding ENSO dynamics and predictability and improving forecast systems. While this essay discusses key issues from an Australian perspective, many of the same issues are important for other ENSO-affected countries and for the international ENSO research community.
    Type of Medium: Online Resource
    ISSN: 0003-0007 , 1520-0477
    URL: Article
    DOI: 10.1175/BAMS-D-18-0057.1
    Language: Unknown
    Publisher: American Meteorological Society
    Publication Date: 2019
    detail.hit.zdb_id: 2029396-3
    detail.hit.zdb_id: 419957-1
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  • 5
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    Previously unidentified Indonesian Throughflow pathways and freshening in the Indian Ocean during recent decades
    Springer Science and Business Media LLC ; 2019
    In:  Scientific Reports Vol. 9, No. 1 ( 2019-05-14)
    Details
    In: Scientific Reports, Springer Science and Business Media LLC, Vol. 9, No. 1 ( 2019-05-14)
    Abstract: The Earth has experienced a global surface warming slowdown (GSWS) or so-called “global warming hiatus” since the end of the 20 th century. The GSWS was marked by a La Niña-like decadal cooling in the Pacific Ocean that subsequently generated an increase in the transfer of Pacific waters into the Indian Ocean via the Indonesian Throughflow (ITF). How the Pacific water spreads through the interior of the Indian Ocean and the impact of these decadal ITF transport changes on the Indian Ocean water mass transformation and circulation remain largely unknown. Here, we analyze the thermohaline structures and current systems at different depths in the Indian Ocean prior to and during the GSWS period. Our study shows that the GSWS involved extensive changes to the Indo-Pacific ocean teleconnection system, characterized by subsurface warming and freshening in the Indian Ocean. A hitherto unknown Indian Ocean pathway of the ITF was discovered off Sumatra associated with prolonged northwestward flow within the South Java Current. Our analysis uncovers a direct linkage of enhanced ITF waters with the Agulhas Current in the Mozambique Channel from thermocline depths down to intermediate depths, that freshened the Indian Ocean. These changes in the Indian Ocean circulation and water mass characteristics impact climate variability through changing the sea surface temperature (SST) and precipitation patterns that can subsequently affect regional economies.
    Type of Medium: Online Resource
    ISSN: 2045-2322
    URL: Article
    DOI: 10.1038/s41598-019-43841-z
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2019
    detail.hit.zdb_id: 2615211-3
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  • 6
    Online Resource
    Online Resource
    PENGARUH EFIKASI DIRI, MOTIVASI KERJA, LINGKUNGAN KERJA TERHADAP KEPUASAN KERJA KARYAWAN PT. SUKANDA DJAYA DENPASAR
    Universitas Udayana ; 2019
    In:  E-Jurnal Manajemen Universitas Udayana Vol. 8, No. 11 ( 2019-11-03), p. 6488-
    Details
    In: E-Jurnal Manajemen Universitas Udayana, Universitas Udayana, Vol. 8, No. 11 ( 2019-11-03), p. 6488-
    Abstract: The purpose of this study was to analyze the effect of self efficacy, work motivation and work environment on employee job satisfaction. The population of this research is all employees of PT. Sukanda Djaya Denpasar Branch numbering 97 people. The sampling technique used is saturated sampling, where all members of the population are sampled. Methods of data collection in this study using questionnaires. The analytical technique used in this study is multiple linear regression analysis. The results showed that self efficacy, work motivation, and work environment have a positive and significant impact on employee work satisfaction. This has the meaning that the higher level of employee confidence in the company, the higher the employee's motivation, and the better the working environment in PT. Sukanda Djaya Denpasar Branch, it will affect the increasing employee job satisfaction Keywords: self-efficacy, job motivation, job environment, job satisfaction
    Type of Medium: Online Resource
    ISSN: 2302-8912
    URL: Issue
    URL: Article
    DOI: 10.24843/EJMUNUD.2019.v08.i11
    DOI: 10.24843/EJMUNUD.2019.v08.i11.p06
    Language: Unknown
    Publisher: Universitas Udayana
    Publication Date: 2019
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  • 7
    Online Resource
    Online Resource
    Understanding ENSO in a Changing Climate
    American Geophysical Union (AGU) ; 2019
    In:  Eos Vol. 100 ( 2019-05-23)
    Details
    In: Eos, American Geophysical Union (AGU), Vol. 100 ( 2019-05-23)
    Abstract: Centre for Southern Hemisphere Oceans Research (CSHOR) ENSO Science Symposium; Hobart, Tasmania, Australia, 29–31 January 2019
    Type of Medium: Online Resource
    ISSN: 2324-9250
    URL: Article
    DOI: 10.1029/2019EO124159
    Language: Unknown
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2019
    detail.hit.zdb_id: 2118760-5
    detail.hit.zdb_id: 240154-X
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  • 8
    Online Resource
    Online Resource
    Contribution of tropical instability waves to ENSO irregularity
    Springer Science and Business Media LLC ; 2019
    In:  Climate Dynamics Vol. 52, No. 3-4 ( 2019-2), p. 1837-1855
    Details
    In: Climate Dynamics, Springer Science and Business Media LLC, Vol. 52, No. 3-4 ( 2019-2), p. 1837-1855
    Type of Medium: Online Resource
    ISSN: 0930-7575 , 1432-0894
    URL: Article
    DOI: 10.1007/s00382-018-4217-0
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2019
    detail.hit.zdb_id: 382992-3
    detail.hit.zdb_id: 1471747-5
    SSG: 16,13
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  • 9
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    Online Resource
    STUDI PERBANDINGAN RANCANG CAMPUR BETON NORMAL MENURUT SNI 03-2834-2000 DAN SNI 7656:2012
    Universitas Negeri Yogyakarta ; 2017
    In:  INERSIA lnformasi dan Ekspose Hasil Riset Teknik Sipil dan Arsitektur Vol. 13, No. 2 ( 2017-12-05), p. 105-115
    Details
    In: INERSIA lnformasi dan Ekspose Hasil Riset Teknik Sipil dan Arsitektur, Universitas Negeri Yogyakarta, Vol. 13, No. 2 ( 2017-12-05), p. 105-115
    Abstract: ABSTRACTThis study examines the design of normal concrete mixtures according to SNI 03-2834-2000 and SNI 7656: 2012. This research is done because SNI 7656: 2012 is an adoption of ACI 211 which requires a mixture considering its economic side. This research was conducted by experimental method in laboratory. In this research, the test object used is concrete cylinder with dimension 150 x 300 mm. The test specimen consists of 2 variants, namely: normal concrete SNI 2000 (BN-00), and normal concrete SNI 2012 (BN-12). Each variant consists of 3 strong compressive specimen plans: 25 MPa, 30MPa, and 35 MPa. Based on the result of the test, it is found that the strength of concrete with the design of SNI 2000 for the compressive strength of 25 MPa (BN-00-25), 30 MPa (BN-00-30) and 35 MPa (BN-00-35) 27.24 MPa, 38.99 MPa, and 44.85 MPa. While the concrete mean press with the design of SNI 2012 for the compressive strength of 25 MPa (BN-12-25), 30 MPa (BN-12-30), and 35 MPa (BN-12-35) plans were 31,43 MPa , 36.54 MPa, and 39.76 MPa. Keywords: mixed design, SNI 03-2834-2000, SNI 7656: 2012, compressive strength   ABSTRAKMakalah ini mengkaji tentang rancang campur beton normal menurut SNI 03-2834-2000 dan SNI 7656:2012. Dilakukannya kajian ini karena SNI 7656:2012 merupakan adopsi dari ACI 211 yang mensyaratkan suatu campuran dengan mempertimbangkan sisi ekonomisnya. Kajian ini dilakukan dengan metode eksperimen di laboratorium. Pada kajian ini benda uji yang digunakan adalah silinder beton dengan dimensi 150 x 300 mm. Benda uji terdiri dari 2 varian yaitu : beton normal SNI 2000 (BN-00), dan beton normal SNI 2012 (BN-12). Tiap varian terdiri dari 3 spesimen kuat tekan rencana yaitu: 25 MPa, 30MPa, dan 35 MPa. Berdasarkan hasil pengujian didapatkan kuat tekan rerata beton dengan rancangan SNI 2000 untuk kuat tekan rencana 25 MPa (BN-00-25), 30 MPa (BN-00-30), dan 35 MPa (BN-00-35) berturut-turut sebesar 27,24 MPa, 38,99 MPa, dan 44,85 MPa. Sedangkan tekan rerata beton dengan rancangan SNI 2012 untuk kuat tekan rencana 25 MPa (BN-12-25), 30 MPa (BN-12-30), dan 35 MPa (BN-12-35) berturut-turut sebesar 31,43 MPa, 36,54 MPa, dan 39,76 MPa.   Kata kunci: rancang campur, SNI 03-2834-2000, SNI 7656:2012, kuat tekan
    Type of Medium: Online Resource
    ISSN: 2528-388X , 0216-762X
    URL: Issue
    URL: Article
    DOI: 10.21831/inersia.v13i2
    DOI: 10.21831/inersia.v13i2.17174
    Language: Unknown
    Publisher: Universitas Negeri Yogyakarta
    Publication Date: 2017
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  • 10
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    Online Resource
    EVALUASI SISTEM PENYALIRAN TAMBANG BATUBARA PADA PT BUMI GAWI BAIMBAI, DESA PENGARON
    Center for Journal Management and Publication, Lambung Mangkurat University ; 2019
    In:  Jurnal Himasapta Vol. 4, No. 01 ( 2019-05-29)
    Details
    In: Jurnal Himasapta, Center for Journal Management and Publication, Lambung Mangkurat University, Vol. 4, No. 01 ( 2019-05-29)
    Abstract: Perancangan PT Bumi Gawi Baimbai pada saat dilakukan penelitian belum memiliki sump dan sistem penyaliran yang memadai. Penelitian ini dilakukan untuk mengatasi masalah air limpasan yang masuk ke dalam front kerja dan dapat menganggu aktifitas penambangan yang dilakukan pada pit Bumi Gawi Baimbai.Pada penelitian ini, perhitungan curah hujan rencana menggunakan metode Gumbel, perhitungan intensitas hujan dihitung dengan pembagian 24 karena curah hujan dari BMKG tidak menggunakan durasi hujan, perhitungan debit limpasan menggunakan metode Rasional, perhitungan kapasitas dan ketahanan sump juga kebutuhan pompa menggunakan metode water balance, dan penentuan luas cacthment area serta pembuatan rencana sistem penyaliran menggunakan software Autocad Land Desktop 2009.Hasil perhitungan curah hujan rencana diperoleh nilai curah hujan rencana untuk periode  ulang 10 tahun yaitu 118,11 mm, intensitas curah hujan per jam sebesar 4,92 mm/jam dengan debit limpasan sebesar 0,66 m3/detik. Luas cacthment area sebesar 53,71 Ha. Air yang dipompa keluar sesuai pompa yang direkomendasikan yaitu kombinasi pompa Mitshubisi multiflo 120 dan Kombinasi pompa Dong Feng CF NM 25 dan 32 sebesar 227.417 m3/jam, 6.153.65 m3/jam dan 15.4357 m3/jam. Desain sump, Untuk Sump 1 saya merencanakan sump dengan panjang atas 16 m , panjang dasar kolam 12 m, lebar kolam 25 m dan kedalaman 8 m. total volume 2800 m3 dan untuk sump 2 desain sump dengan panjang atas 16 m, panjang dasar kolam 12 m, lebar kolam 26 m dan kedalaman 7 m, volume total rencana 2548 m3.Sump 1 kebutuhan pompa  yaitu 2 unit pompa Mitsubishi MF 120,  dan sump 2  jumlah pompa dong feng sebanyak 7 buah. Kata-kata kunci : Curah Hujan Rencana, Intensitas Hujan, Debit Limpasan, Cacthment Area, Pompa, Sump
    Type of Medium: Online Resource
    ISSN: 2527-4619 , 2579-7816
    URL: Issue
    URL: Article
    DOI: 10.20527/jhs.v4i01
    DOI: 10.20527/jhs.v4i01.475
    Language: Unknown
    Publisher: Center for Journal Management and Publication, Lambung Mangkurat University
    Publication Date: 2019
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