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  • Wiley  (6)
  • 2020-2024  (6)
  • 1
    Online Resource
    Online Resource
    Decadal phase shift of summertime Arctic dipole pattern and its nonlinear effect on sea ice extent
    Wiley ; 2021
    In:  International Journal of Climatology Vol. 41, No. 9 ( 2021-07), p. 4732-4742
    Details
    In: International Journal of Climatology, Wiley, Vol. 41, No. 9 ( 2021-07), p. 4732-4742
    Abstract: The rapid decline in Arctic sea ice during recent decades has been attributed to the combined influence of global warming and internal climate variability. Herein, we elucidate the process by which the decrease in sea ice is accelerated in association with the decadal phase shift of the Arctic dipole (AD), using observational data and Community Earth System Model (CESM1) simulations. The influence of the AD on Arctic sea ice varied according to its phase; in the negative‐AD decades (1979–1998), atmospheric circulation during summers of positive phase AD acts to reduce the sea ice extent (SIE) in the Pacific sector but increases it in the Atlantic sector. In contrast, in the positive‐AD decades (after 1999), the same atmospheric circulation pattern reduces the SIE in both sectors, resulting in enhanced sea ice melting across the entire Arctic region. A similar nonlinear relationship between the AD phase and SIE change is also observed in CESM1 Pre‐Industrial simulations, which stem from altered background temperature conditions between periods, implying the significant role of internal variability, particularly over the Atlantic sector. However, contrary to the recently observed AD trend, CESM1 Large Ensemble experiments predicted a negative AD trend as global warming proceeded. This suggests that the recent positive AD phase may be naturally driven, but the current state of sea ice decline associated with AD could be altered in the near future because of enhanced global warming.
    Type of Medium: Online Resource
    ISSN: 0899-8418 , 1097-0088
    URL: Issue
    URL: Article
    DOI: 10.1002/joc.v41.9
    DOI: 10.1002/joc.7097
    RVK:
    RA 1000
    Language: English
    Publisher: Wiley
    Publication Date: 2021
    detail.hit.zdb_id: 1491204-1
    SSG: 14
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  • 2
    Online Resource
    Online Resource
    Regime shift increase in East Asia's summer extreme hot day frequency across the late 1990s
    Wiley ; 2023
    In:  International Journal of Climatology Vol. 43, No. 5 ( 2023-04), p. 2305-2317
    Details
    In: International Journal of Climatology, Wiley, Vol. 43, No. 5 ( 2023-04), p. 2305-2317
    Abstract: Here we analysed the long‐term change in extreme hot days (EHDs) in East Asia during boreal summer (June–July–August) since 1979, where EHDs was defined as days exceeding or equalling the 90th percentile threshold of the climatological (1991–2020) daily and . EHDs frequency occurrence in East Asia during summer showed not only an increasing trend but also a distinct regime shift increase since the late 1990s. Based on this regime shift, we divided these years into two periods, P1 (1979–1998) and P2 (1999–2021), and found that different physical processes operated for each period's EHDs variability. P2's EHDs was related to the stationary wave originating from both the North Atlantic Ocean and the Indo‐Pacific warm pool, but these influences did not appear in P1. To investigate whether the observed regime shift increase was caused by natural variability or greenhouse gas concentration increases, we conducted a CO 2 quadrupling experiment as well as a present‐day experiment with a fixed CO 2 concentration using the Community Earth System Model with 28 ensemble members. We demonstrated that the regime shift increase of East Asian EHDs occurrences was due to increasing greenhouse gas concentrations. We further discussed the influence of Arctic sea ice reduction due to global warming on EHDs occurrences in East Asia.
    Type of Medium: Online Resource
    ISSN: 0899-8418 , 1097-0088
    URL: Issue
    URL: Article
    DOI: 10.1002/joc.v43.5
    DOI: 10.1002/joc.7976
    RVK:
    RA 1000
    Language: English
    Publisher: Wiley
    Publication Date: 2023
    detail.hit.zdb_id: 1491204-1
    SSG: 14
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Timescale‐dependent AMOC–AMO relationship in an earth system model of intermediate complexity
    Wiley ; 2021
    In:  International Journal of Climatology Vol. 41, No. S1 ( 2021-01)
    Details
    In: International Journal of Climatology, Wiley, Vol. 41, No. S1 ( 2021-01)
    Abstract: The relationship between Atlantic multi‐decadal oscillation (AMO) and Atlantic meridional overturning circulation (AMOC) is examined with respect to two (inter‐ and multi‐decadal) different timescales using a long‐term unforced simulation of an earth system model of intermediate complexity. In the inter‐decadal timescale, the AMO and the AMOC establish a self‐sustaining oscillatory mode; the AMOC induces the positive AMO through meridional heat transport (MHT), but with the time delay of approximately 7 years as the AMOC anomalies propagate southward over time within the Atlantic basin. After then, the AMO reduces the density in the main sinking region and brings the negative phase of the AMOC, which results in the rest half of the cycle. On the other hand, in the multi‐decadal timescale, the AMO and the AMOC are almost in phase because the AMOC is spatially stationary, resulting in a pan‐Atlantic surface warming. In addition, the Arctic‐originated density fluctuations are required for the multi‐decadal AMOC to switch its phase. The results obtained in this study suggest that timescale dependency should be considered when investigating the AMOC–AMO relationship.
    Type of Medium: Online Resource
    ISSN: 0899-8418 , 1097-0088
    URL: Issue
    URL: Article
    DOI: 10.1002/joc.v41.S1
    DOI: 10.1002/joc.6926
    RVK:
    RA 1000
    Language: English
    Publisher: Wiley
    Publication Date: 2021
    detail.hit.zdb_id: 1491204-1
    SSG: 14
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Influence of retreating Barents–Kara sea ice on the periodicity of El Niño–Southern Oscillation
    Wiley ; 2022
    In:  International Journal of Climatology Vol. 42, No. 9 ( 2022-07), p. 4881-4892
    Details
    In: International Journal of Climatology, Wiley, Vol. 42, No. 9 ( 2022-07), p. 4881-4892
    Abstract: The abrupt decline in sea ice in the Barents–Kara (BK) Sea because of global warming has been argued to influence not only higher latitudes but also the tropics. Using EC‐Earth model simulations, we demonstrated that the El Niño–Southern Oscillation (ENSO) period becomes longer when BK sea ice substantially decreases. As BK sea ice was forcibly reduced through nudging experiments, the mean Walker circulation shifted to the west, and the zonal sea surface temperature contrast in the tropical Pacific was enhanced. Consequently, the western Pacific mean thermocline became deeper, which reduced the sensitivity of oceanic wave response to wind forcing. Therefore, the oceanic Kelvin waves reflected by ENSO‐induced surface winds, a primary delayed negative feedback factor, were significantly weakened. Thus, ENSO phases could be sustained for longer.
    Type of Medium: Online Resource
    ISSN: 0899-8418 , 1097-0088
    URL: Issue
    URL: Article
    DOI: 10.1002/joc.v42.9
    DOI: 10.1002/joc.7509
    RVK:
    RA 1000
    Language: English
    Publisher: Wiley
    Publication Date: 2022
    detail.hit.zdb_id: 1491204-1
    SSG: 14
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  • 5
    Online Resource
    Online Resource
    Mid‐latitude leading double‐dip La Niña
    Wiley ; 2021
    In:  International Journal of Climatology Vol. 41, No. S1 ( 2021-01)
    Details
    In: International Journal of Climatology, Wiley, Vol. 41, No. S1 ( 2021-01)
    Abstract: Understanding the evolution asymmetry between El Niño and La Niña events is challenging. Unlike El Niño, most La Niña events are characterised by a double‐dip cooling (a.k.a. multi‐year La Niña). Herein, we examined how single‐ and multi‐year La Niña events differ by analysing observational and climate‐model data sets. Single‐year La Niña events tend to develop narrowly within the tropics from a central Pacific‐type El Niño (Niño‐4  〉  Niño‐3), whereas multi‐year La Niña events tend to originate from an eastern Pacific‐type El Niño (Niño‐3  〉  Niño‐4) and are well‐connected to mid‐latitudes through the Pacific meridional mode , which leads to a meridionally wider response of the off‐equatorial low‐level atmospheric anti‐cyclonic circulation. As the anti‐cyclonic circulation controls the amount of equatorial upper‐ocean heat recharge through Sverdrup transport, for single‐year La Niña, efficient ocean recharging due to a narrower anti‐cyclonic circulation causes a fast transition to an El Niño or a fast termination of a La Niña. In contrast, for multi‐year La Niña, a weaker recharging causes surface cooling to persist, leading to another La Niña in the following year.
    Type of Medium: Online Resource
    ISSN: 0899-8418 , 1097-0088
    URL: Issue
    URL: Article
    URL: Article
    DOI: 10.1002/joc.v41.S1
    DOI: 10.1002/joc.6772
    DOI: 10.37473/fic/10.1002/joc.6772
    RVK:
    RA 1000
    Language: English
    Publisher: Wiley
    Publication Date: 2021
    detail.hit.zdb_id: 1491204-1
    SSG: 14
    Location Call Number Limitation Availability
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    Online Resource
  • 6
    Online Resource
    Online Resource
    Geriatric Nutritional Risk Index as a prognostic marker in patients with extensive‐stage disease small cell lung cancer: Results from a randomized controlled trial
    Wiley ; 2020
    In:  Thoracic Cancer Vol. 11, No. 1 ( 2020-01), p. 62-71
    Details
    In: Thoracic Cancer, Wiley, Vol. 11, No. 1 ( 2020-01), p. 62-71
    Abstract: Clinical impact of the Geriatric Nutritional Risk Index (GNRI) in patients with extensive‐stage disease small cell lung cancer (ED‐SCLC) have not previously been reported. Methods This study analyzed 352 patients enrolled in a previous randomized phase III trial comparing the efficacy of irinotecan plus cisplatin with that of etoposide plus cisplatin as the first‐line therapy for ED‐SCLC. GNRI values were calculated using serum albumin levels and actual and ideal bodyweights. Patients with a GNRI  〉  98, 92–98, and 〈 92 were grouped into no, low, and moderate/major risk groups, respectively. Results The objective response rates were 63.2%, 52.6%, and 49.2% in the no, low, and moderate/major risk groups, respectively ( P = 0.024). The median progression‐free survival (PFS) was shorter in patients with a lower GNRI than in those with a higher GNRI (no vs. low vs. moderate/major risk group; 6.5 vs. 5.8 vs. 5.9 months, respectively; P = 0.028). There were significant differences in median overall survival (OS) according to GNRI (no vs. low vs. moderate/major risk group; 13.2 vs. 10.3 vs. 8.4 months, respectively; P   〈  0.001). Multivariate analysis revealed that being in the moderate/major risk group was an independent poor prognostic factor for PFS (hazard ratio [HR]: 1.300, 95% confidence interval [CI] : 1.012–1.670; P = 0.040) and OS (HR: 1.539; 95% CI: 1.069–2.216; P = 0.020). Conclusions This prospective study shows that a low GNRI value was associated with a poor prognosis, and it supports the relationship between systemic inflammation, nutritional status, and clinical outcomes in patients with ED‐SCLC.Key points Significant findings of the study The lower GNRI group had a low response rate to chemotherapy for ED‐SCLC. The HRs for PFS and OS were 1.300 and 1.539 in the patients with GNRI  〈  92. What this study adds Low GNRI is associated with poor prognosis in ED‐SCLC.
    Type of Medium: Online Resource
    ISSN: 1759-7706 , 1759-7714
    URL: Issue
    URL: Article
    DOI: 10.1111/tca.v11.1
    DOI: 10.1111/1759-7714.13229
    Language: English
    Publisher: Wiley
    Publication Date: 2020
    detail.hit.zdb_id: 2559245-2
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