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  • 1
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    Variability in the Concentration of Lithium in the Indo‐Pacific Ocean (2022)
    Details
    Publication Date: 2022-10-04
    Description: Lithium has limited biological activity and can readily replace aluminium, magnesium and iron ions in aluminosilicates, making it a proxy for the inorganic silicate cycle and its potential link to the carbon cycle. Data from the North Pacific Ocean, tropical Indian Ocean, Southern Ocean and Red Sea suggest that salinity normalized dissolved lithium concentrations vary by up to 2%–3% in the Indo‐Pacific Ocean. The highest lithium concentrations were measured in surface waters of remote North Pacific and Indian Ocean stations that receive relatively high fluxes of dust. The lowest dissolved lithium concentrations were measured just below the surface mixed layer of the stations with highest surface water concentrations, consistent with removal into freshly forming aluminium rich phases and manganese oxides. In the North Pacific, water from depths 〉2,000 m is slightly depleted in lithium compared to the initial composition of Antarctic Bottom Water, likely due to uptake of lithium by authigenically forming aluminosilicates. The results of this study suggest that the residence time of lithium in the ocean may be significantly shorter than calculated from riverine and hydrothermal fluxes.
    Description: Key Points: Li/Na ratios vary by up to 2%–3% in the Indian and Pacific Oceans. Authigenic formation of aluminosilicates slightly deplete deep‐water lithium concentrations in the North Pacific. The residence time of lithium in the ocean is 240,000 ± 70,000 years, based on removal from North Pacific deep‐water.
    Description: Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659
    Description: MoES, Indian National Centre for Ocean Information Services http://dx.doi.org/10.13039/501100004814
    Description: National Science Foundation USA
    Description: https://doi.pangaea.de/10.1594/PANGAEA.941888
    Keywords: ddc:551
    Language: English
    Type: doc-type:article
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    CITATION GEO-LEO
  • 2
    Electronic Resource
    Electronic Resource
    A dipole mode in the tropical Indian Ocean (1999)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 401 (1999), S. 360-363 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] For the tropical Pacific and Atlantic oceans, internal modes of variability that lead to climatic oscillations have been recognized, but in the Indian Ocean region a similar ocean–atmosphere interaction causing interannual climate variability has not yet been found. Here we report an ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/401360a0
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Water vapour flux divergence over the Arabian Sea during 1987 summer monsoon using satellite data (1990)
    Springer
    Boundary layer meteorology 51 (1990), S. 199-209 
    Details
    ISSN: 1573-1472
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The evaporation rates over the Arabian Sea (AS) for the summer monsoon months (June to September) of 1987 have been computed using the bulk-aerodynamic formula. The satellite derived precipitation from the INSAT-1B VHRR (Very High Resolution Radiometer) sensor operating in the wavelength 10.5–12.5 Μm has been used for computing the precipitation over the AS. The net water vapour flux divergence (NFD) over AS has been computed as the difference between evaporation and precipitation. The estimates being -0.02 × 1010, 2.55 × 1010, 0.70 × 1010 and 0.44 × 1010 tons/day respectively for the months June, July, August and September. The NFD over AS was found to be positively and significantly correlated with the mean monsoon rainfall along the west coast of India.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00120468
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    Paper (German National Licenses)
    Fulltext
  • 4
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    Variability in the Concentration of Lithium in the Indo‐Pacific Ocean (2022)
    AGU (American Geophysical Union) | Wiley
    Details
    Publication Date: 2024-02-07
    Description: Lithium has limited biological activity and can readily replace aluminium, magnesium and iron ions in aluminosilicates, making it a proxy for the inorganic silicate cycle and its potential link to the carbon cycle. Data from the North Pacific Ocean, tropical Indian Ocean, Southern Ocean and Red Sea suggest that salinity normalized dissolved lithium concentrations vary by up to 2%–3% in the Indo-Pacific Ocean. The highest lithium concentrations were measured in surface waters of remote North Pacific and Indian Ocean stations that receive relatively high fluxes of dust. The lowest dissolved lithium concentrations were measured just below the surface mixed layer of the stations with highest surface water concentrations, consistent with removal into freshly forming aluminium rich phases and manganese oxides. In the North Pacific, water from depths 〉2,000 m is slightly depleted in lithium compared to the initial composition of Antarctic Bottom Water, likely due to uptake of lithium by authigenically forming aluminosilicates. The results of this study suggest that the residence time of lithium in the ocean may be significantly shorter than calculated from riverine and hydrothermal fluxes. Key Points Li/Na ratios vary by up to 2%–3% in the Indian and Pacific Oceans Authigenic formation of aluminosilicates slightly deplete deep-water lithium concentrations in the North Pacific The residence time of lithium in the ocean is 240,000 ± 70,000 years, based on removal from North Pacific deep-water
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: other
    Format: other
    Format: other
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Review of monsoons, interannual variability and decadal trends that underpin climate prediction (2005)
    Details
    Publication Date: 2021-05-19
    Description: Understanding and predicting the interannual variations of the whole monsoon climate system has been, and will continue to be, one of the major reasons for studying the oceanography of the Indian Ocean; but there are other reasons. Knowledge about Indian Ocean current systems may have diverse practical applications, from fisheries through search and rescue to management of Exclusive Economic Zones. Our discussion mainly concerns the open ocean and the climate applications, but the results are important for most continental shelves of the Indian Ocean region on all but the shortest timescales. We start by discussing what we know now of the Indian Ocean’s mean annual cycle, painfully gleaned from sparse observations over the last four decades. This data base for understanding the interannual variability of the Indian Ocean climate has not been adequate until very recently; however, this data base is in the process of expanding radically, due to the availability of four new tools. These are: satellite data (altimeter, wind stress); surface flux products, from weather forecast reanalyses; output of fine-scale numerical models, driven with those fluxes; and data from profiling floats. As we will see in various talks, this is revolutionising our understanding of variability in the Indian Ocean. CLIVAR’s Asian-Australian Monsoon Panel is starting to plan a programme of further observations, to coincide with a useful conjunction of observation satellites in 2003. This will be aimed at filling the larger remaining gaps in our understanding of Indian Ocean dynamics, (with emphasis on understanding its role in the monsoon cycle).
    Description: Published
    Keywords: Monsoons ; Climate prediction
    Repository Name: AquaDocs
    Type: Working Paper , Non-Refereed
    Format: 1224382 bytes
    Format: application/pdf
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    PAPER (OA)
  • 6
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    Key results from the Bay of Bengal Boundary Layer Experiment (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-07-04
    Description: The Bengal Boundary Layer Experiment (BoBBLE) is a joint project between Ministry of Earth Sciences, Govt. of India and Natural Environment Research Council, UK. The BoBBLE field programme was conducted during the summer monsoon of 2016 with the prime objective of producing new, high-quality, comprehensive observational data sets of ocean state and atmospheric fluxes through a dedicated field campaign in a key under-observed region, the southern Bay of Bengal. New results that emerged from the BoBBLE observational programme is summarised in this presentation. The BoBBLE cruise was conducted on board ORV Sindhu Sadhana (CSIR-NIO, Goa) during 23rd June – 24th July 2016. In the ocean, 148 CTD profiles, 930 underway-CTD (uCTD) profiles, 64 turbulence profiles, 37 radiometer profiles, 161 Argo profiles, and 915 glider profiles were measured. In addition, continuous monitoring was carried out using an autosal and ADCP. Biological and chemical properties were measured using water samples. Atmospheric measurements were made using an automated weather station, an eddy covariance system and radiosonde profiling was carried out twice during every day. The in situ data set unravelled several physical and biogeochemical processes occurring in the southern Bay of Bengal during summer monsoon. The key results include formation and erosion of barrier layers, discovery of double diffusion and salt fingering, closing of the mixed layer heat budget using ground-breaking observational approach, dynamical control of chlorophyll profiles, CO2 emission, and oxygenation of the OMZ.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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