On the spatio-temporal distribution of stable isotope ratios in the hydrological cycle over India and the Southern Ocean
The isotopic composition of water vapor and precipitation at continental and oceanic sites depends on factors such as: the geographical location of the sampling site, meteorological conditions at the moisture source areas, local meteorological conditions, rainout history of air-masses along their tr...
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ftiiscdiss:oai:etd.iisc.ac.in:2005/4353 2024-06-09T07:49:43+00:00 On the spatio-temporal distribution of stable isotope ratios in the hydrological cycle over India and the Southern Ocean Dar, Shaakir Shabir Ghosh, Prosenjit 2020 application/pdf https://etd.iisc.ac.in/handle/2005/4353 en_US eng https://etd.iisc.ac.in/handle/2005/4353 I grant Indian Institute of Science the right to archive and to make available my thesis or dissertation in whole or in part in all forms of media, now hereafter known. I retain all proprietary rights, such as patent rights. I also retain the right to use in future works (such as articles or books) all or part of this thesis or dissertation oxygen Hydrogen isotopic composition precipitation Craig and Gordon models Research Subject Categories::TECHNOLOGY::Civil engineering and architecture::Water engineering Thesis 2020 ftiiscdiss 2024-05-15T03:05:27Z The isotopic composition of water vapor and precipitation at continental and oceanic sites depends on factors such as: the geographical location of the sampling site, meteorological conditions at the moisture source areas, local meteorological conditions, rainout history of air-masses along their trajectory, large-scale moisture recycling below cloud evaporation, etc. The present study aims at identification and quantification of such processes over the Indian subcontinent and the Southern Ocean based on observed stable isotopic composition in precipitation and atmospheric moisture. The oxygen and hydrogen isotopic composition of precipitation at Srinagar, Kashmir, allowed delineating the respective role of large-scale moisture transport processes vs that of other meteorological factors such as temperature and precipitation amount. The time integrated, large-scale convective activity over several days, constitutes a major factor governing the isotopic composition of precipitation at Srinagar, whereas local meteorological factors play a minor role. Over the Southern Ocean, as opposed to local factors, atmospheric pressure and air temperature majorly govern the precipitation isotopic composition. The isotopic data was further used to estimate the moisture sources contributing to the summer precipitation at Kolkata and summer/winter precipitation at Srinagar. A simple box model was developed to simulate the moisture transport and mixing to estimate the contribution of sources to precipitation at Srinagar and Kolkata. Precipitation at Srinagar, during the active period of the Western Disturbances, carries 80% of moisture from the Mediterranean region while the balance originates from the Arabian area. Adopting moisture source isotope signatures observed over a long-time span at the New viii Abstract ix Delhi station, the Rayleigh’s distillation model explains the observed variability in the isotopic data at Kashmir Valley during the Indian Summer Monsoon. At Kolkata, the Bay of Bengal is a major moisture contributor ... Thesis Southern Ocean Indian Instiute of Science, Bangalore: etd@IIsc (Electronic Theses and Disserations) Indian Southern Ocean |
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Open Polar |
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Indian Instiute of Science, Bangalore: etd@IIsc (Electronic Theses and Disserations) |
op_collection_id |
ftiiscdiss |
language |
English |
topic |
oxygen Hydrogen isotopic composition precipitation Craig and Gordon models Research Subject Categories::TECHNOLOGY::Civil engineering and architecture::Water engineering |
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oxygen Hydrogen isotopic composition precipitation Craig and Gordon models Research Subject Categories::TECHNOLOGY::Civil engineering and architecture::Water engineering Dar, Shaakir Shabir On the spatio-temporal distribution of stable isotope ratios in the hydrological cycle over India and the Southern Ocean |
topic_facet |
oxygen Hydrogen isotopic composition precipitation Craig and Gordon models Research Subject Categories::TECHNOLOGY::Civil engineering and architecture::Water engineering |
description |
The isotopic composition of water vapor and precipitation at continental and oceanic sites depends on factors such as: the geographical location of the sampling site, meteorological conditions at the moisture source areas, local meteorological conditions, rainout history of air-masses along their trajectory, large-scale moisture recycling below cloud evaporation, etc. The present study aims at identification and quantification of such processes over the Indian subcontinent and the Southern Ocean based on observed stable isotopic composition in precipitation and atmospheric moisture. The oxygen and hydrogen isotopic composition of precipitation at Srinagar, Kashmir, allowed delineating the respective role of large-scale moisture transport processes vs that of other meteorological factors such as temperature and precipitation amount. The time integrated, large-scale convective activity over several days, constitutes a major factor governing the isotopic composition of precipitation at Srinagar, whereas local meteorological factors play a minor role. Over the Southern Ocean, as opposed to local factors, atmospheric pressure and air temperature majorly govern the precipitation isotopic composition. The isotopic data was further used to estimate the moisture sources contributing to the summer precipitation at Kolkata and summer/winter precipitation at Srinagar. A simple box model was developed to simulate the moisture transport and mixing to estimate the contribution of sources to precipitation at Srinagar and Kolkata. Precipitation at Srinagar, during the active period of the Western Disturbances, carries 80% of moisture from the Mediterranean region while the balance originates from the Arabian area. Adopting moisture source isotope signatures observed over a long-time span at the New viii Abstract ix Delhi station, the Rayleigh’s distillation model explains the observed variability in the isotopic data at Kashmir Valley during the Indian Summer Monsoon. At Kolkata, the Bay of Bengal is a major moisture contributor ... |
author2 |
Ghosh, Prosenjit |
format |
Thesis |
author |
Dar, Shaakir Shabir |
author_facet |
Dar, Shaakir Shabir |
author_sort |
Dar, Shaakir Shabir |
title |
On the spatio-temporal distribution of stable isotope ratios in the hydrological cycle over India and the Southern Ocean |
title_short |
On the spatio-temporal distribution of stable isotope ratios in the hydrological cycle over India and the Southern Ocean |
title_full |
On the spatio-temporal distribution of stable isotope ratios in the hydrological cycle over India and the Southern Ocean |
title_fullStr |
On the spatio-temporal distribution of stable isotope ratios in the hydrological cycle over India and the Southern Ocean |
title_full_unstemmed |
On the spatio-temporal distribution of stable isotope ratios in the hydrological cycle over India and the Southern Ocean |
title_sort |
on the spatio-temporal distribution of stable isotope ratios in the hydrological cycle over india and the southern ocean |
publishDate |
2020 |
url |
https://etd.iisc.ac.in/handle/2005/4353 |
geographic |
Indian Southern Ocean |
geographic_facet |
Indian Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
https://etd.iisc.ac.in/handle/2005/4353 |
op_rights |
I grant Indian Institute of Science the right to archive and to make available my thesis or dissertation in whole or in part in all forms of media, now hereafter known. I retain all proprietary rights, such as patent rights. I also retain the right to use in future works (such as articles or books) all or part of this thesis or dissertation |
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1801382505866067968 |