Spatial variation of amount effect over peninsular India and Sri Lanka: Role of seasonality
The relationship between rain amount and rain δ18O of monsoon rain (amount effect) helps to reconstruct past monsoon variability from proxies (e.g., tree rings and speleothems). Analysis of new (and published) data of the δ18O of monsoon rains and vapor at nine stations shows that in regions of dist...
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| Veröffentlicht in: | Geophysical research letters 2015-07, Vol.42 (13), p.5500-5507 |
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| creator | Lekshmy, P. R. Midhun, M. Ramesh, R. |
| description | The relationship between rain amount and rain δ18O of monsoon rain (amount effect) helps to reconstruct past monsoon variability from proxies (e.g., tree rings and speleothems). Analysis of new (and published) data of the δ18O of monsoon rains and vapor at nine stations shows that in regions of distinct seasonality in precipitation (e.g., peninsular India), the noise in such reconstructions can be minimized by a careful selection of sites. Peninsular India receives rain from both the Indian summer monsoon (ISM) and the northeast monsoon (NEM). Significant amount effect is observed only where the NEM rainfall is larger than or comparable to ISM rainfall. This is due to the higher quantity of NEM rain with more depleted 18O relative to ISM rain. NEM rain is more depleted in 18O because of cyclonic activity over Bay of Bengal, and the 18O depletion of Bay of Bengal surface waters due to post‐ISM river runoff.
Key Points
Spatial variations of amount effect is driven by ratio of ISM to NEM rains
Significant amount effect is observed in NEM‐dominated region
More 18O depletion of NEM rain is likely due to the cyclonic storms over BoB |
| doi_str_mv | 10.1002/2015GL064517 |
| format | Article |
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Key Points
Spatial variations of amount effect is driven by ratio of ISM to NEM rains
Significant amount effect is observed in NEM‐dominated region
More 18O depletion of NEM rain is likely due to the cyclonic storms over BoB</description><identifier>ISSN: 0094-8276</identifier><identifier>EISSN: 1944-8007</identifier><identifier>DOI: 10.1002/2015GL064517</identifier><language>eng</language><publisher>Washington: Blackwell Publishing Ltd</publisher><subject>amount effect ; Atmospheric precipitations ; Bay of Bengal ; Cyclonic activity ; Depletion ; India ; Monsoon rainfall ; Monsoons ; Noise ; Noise prediction ; paleomonsoon ; Precipitation ; Rain ; Rainfall ; Reconstruction ; River discharge ; River flow ; River runoff ; Runoff ; Seasonal variations ; Seasonality ; Spatial variations ; stable isotopes ; Summer ; Summer monsoon ; Surface water ; Tree rings ; Variability ; Wind</subject><ispartof>Geophysical research letters, 2015-07, Vol.42 (13), p.5500-5507</ispartof><rights>2015. American Geophysical Union. All Rights Reserved.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c5425-bc4782a0c376c9de64919842efdd0ba9c421d249c562e7ab1ce2ea9d46054db83</citedby><cites>FETCH-LOGICAL-c5425-bc4782a0c376c9de64919842efdd0ba9c421d249c562e7ab1ce2ea9d46054db83</cites><orcidid>0000-0002-0673-1811</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1002%2F2015GL064517$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1002%2F2015GL064517$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,780,784,1417,1433,11514,27924,27925,45574,45575,46409,46468,46833,46892</link.rule.ids></links><search><creatorcontrib>Lekshmy, P. R.</creatorcontrib><creatorcontrib>Midhun, M.</creatorcontrib><creatorcontrib>Ramesh, R.</creatorcontrib><title>Spatial variation of amount effect over peninsular India and Sri Lanka: Role of seasonality</title><title>Geophysical research letters</title><addtitle>Geophys. Res. Lett</addtitle><description>The relationship between rain amount and rain δ18O of monsoon rain (amount effect) helps to reconstruct past monsoon variability from proxies (e.g., tree rings and speleothems). Analysis of new (and published) data of the δ18O of monsoon rains and vapor at nine stations shows that in regions of distinct seasonality in precipitation (e.g., peninsular India), the noise in such reconstructions can be minimized by a careful selection of sites. Peninsular India receives rain from both the Indian summer monsoon (ISM) and the northeast monsoon (NEM). Significant amount effect is observed only where the NEM rainfall is larger than or comparable to ISM rainfall. This is due to the higher quantity of NEM rain with more depleted 18O relative to ISM rain. NEM rain is more depleted in 18O because of cyclonic activity over Bay of Bengal, and the 18O depletion of Bay of Bengal surface waters due to post‐ISM river runoff.
Key Points
Spatial variations of amount effect is driven by ratio of ISM to NEM rains
Significant amount effect is observed in NEM‐dominated region
More 18O depletion of NEM rain is likely due to the cyclonic storms over BoB</description><subject>amount effect</subject><subject>Atmospheric precipitations</subject><subject>Bay of Bengal</subject><subject>Cyclonic activity</subject><subject>Depletion</subject><subject>India</subject><subject>Monsoon rainfall</subject><subject>Monsoons</subject><subject>Noise</subject><subject>Noise prediction</subject><subject>paleomonsoon</subject><subject>Precipitation</subject><subject>Rain</subject><subject>Rainfall</subject><subject>Reconstruction</subject><subject>River discharge</subject><subject>River flow</subject><subject>River runoff</subject><subject>Runoff</subject><subject>Seasonal variations</subject><subject>Seasonality</subject><subject>Spatial variations</subject><subject>stable isotopes</subject><subject>Summer</subject><subject>Summer monsoon</subject><subject>Surface water</subject><subject>Tree rings</subject><subject>Variability</subject><subject>Wind</subject><issn>0094-8276</issn><issn>1944-8007</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><recordid>eNqF0U1rFEEQBuBGFFyjN39AgxcPjlZ_T3vTYDaBQSFRAnpoant6oJPZ7rV7Jrr_3llWRDzEU72H5y0oipDnDF4zAP6GA1PrDrRUzDwgK2albFoA85CsAOySudGPyZNabwBAgGAr8u1qh1PEkd5hiUvKieaB4jbPaaJhGIKfaL4Lhe5CiqnOIxZ6kfqIFFNPr0qkHaZbfEsv8xgO1Rqw5oRjnPZPyaMBxxqe_Z4n5MvZh8-n5033aX1x-q5rvJJcNRsvTcsRvDDa2z5oaZltJQ9D38MGrZec9VxarzQPBjfMBx7Q9lKDkv2mFSfk5XHvruTvc6iT28bqwzhiCnmujrXQCmOkFf-nhrVWSaMO9MU_9CbPZblsUZaBBaGB36u0tYKLVstFvToqX3KtJQxuV-IWy94xcIfXub9ft3B-5D_iGPb3Wre-7JRgTC2l5liKdQo__5Sw3DpthFHu-uPaqa9n1-fvpXJC_ALwGaZ8</recordid><startdate>20150716</startdate><enddate>20150716</enddate><creator>Lekshmy, P. R.</creator><creator>Midhun, M.</creator><creator>Ramesh, R.</creator><general>Blackwell Publishing Ltd</general><general>John Wiley & Sons, Inc</general><scope>BSCLL</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>7TN</scope><scope>8FD</scope><scope>F1W</scope><scope>FR3</scope><scope>H8D</scope><scope>H96</scope><scope>KL.</scope><scope>KR7</scope><scope>L.G</scope><scope>L7M</scope><scope>7UA</scope><scope>C1K</scope><orcidid>https://orcid.org/0000-0002-0673-1811</orcidid></search><sort><creationdate>20150716</creationdate><title>Spatial variation of amount effect over peninsular India and Sri Lanka: Role of seasonality</title><author>Lekshmy, P. R. ; Midhun, M. ; Ramesh, R.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c5425-bc4782a0c376c9de64919842efdd0ba9c421d249c562e7ab1ce2ea9d46054db83</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2015</creationdate><topic>amount effect</topic><topic>Atmospheric precipitations</topic><topic>Bay of Bengal</topic><topic>Cyclonic activity</topic><topic>Depletion</topic><topic>India</topic><topic>Monsoon rainfall</topic><topic>Monsoons</topic><topic>Noise</topic><topic>Noise prediction</topic><topic>paleomonsoon</topic><topic>Precipitation</topic><topic>Rain</topic><topic>Rainfall</topic><topic>Reconstruction</topic><topic>River discharge</topic><topic>River flow</topic><topic>River runoff</topic><topic>Runoff</topic><topic>Seasonal variations</topic><topic>Seasonality</topic><topic>Spatial variations</topic><topic>stable isotopes</topic><topic>Summer</topic><topic>Summer monsoon</topic><topic>Surface water</topic><topic>Tree rings</topic><topic>Variability</topic><topic>Wind</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Lekshmy, P. R.</creatorcontrib><creatorcontrib>Midhun, M.</creatorcontrib><creatorcontrib>Ramesh, R.</creatorcontrib><collection>Istex</collection><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Oceanic Abstracts</collection><collection>Technology Research Database</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Civil Engineering Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Water Resources Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><jtitle>Geophysical research letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Lekshmy, P. R.</au><au>Midhun, M.</au><au>Ramesh, R.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Spatial variation of amount effect over peninsular India and Sri Lanka: Role of seasonality</atitle><jtitle>Geophysical research letters</jtitle><addtitle>Geophys. Res. Lett</addtitle><date>2015-07-16</date><risdate>2015</risdate><volume>42</volume><issue>13</issue><spage>5500</spage><epage>5507</epage><pages>5500-5507</pages><issn>0094-8276</issn><eissn>1944-8007</eissn><abstract>The relationship between rain amount and rain δ18O of monsoon rain (amount effect) helps to reconstruct past monsoon variability from proxies (e.g., tree rings and speleothems). Analysis of new (and published) data of the δ18O of monsoon rains and vapor at nine stations shows that in regions of distinct seasonality in precipitation (e.g., peninsular India), the noise in such reconstructions can be minimized by a careful selection of sites. Peninsular India receives rain from both the Indian summer monsoon (ISM) and the northeast monsoon (NEM). Significant amount effect is observed only where the NEM rainfall is larger than or comparable to ISM rainfall. This is due to the higher quantity of NEM rain with more depleted 18O relative to ISM rain. NEM rain is more depleted in 18O because of cyclonic activity over Bay of Bengal, and the 18O depletion of Bay of Bengal surface waters due to post‐ISM river runoff.
Key Points
Spatial variations of amount effect is driven by ratio of ISM to NEM rains
Significant amount effect is observed in NEM‐dominated region
More 18O depletion of NEM rain is likely due to the cyclonic storms over BoB</abstract><cop>Washington</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1002/2015GL064517</doi><tpages>8</tpages><orcidid>https://orcid.org/0000-0002-0673-1811</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | amount effect Atmospheric precipitations Bay of Bengal Cyclonic activity Depletion India Monsoon rainfall Monsoons Noise Noise prediction paleomonsoon Precipitation Rain Rainfall Reconstruction River discharge River flow River runoff Runoff Seasonal variations Seasonality Spatial variations stable isotopes Summer Summer monsoon Surface water Tree rings Variability Wind |
| title | Spatial variation of amount effect over peninsular India and Sri Lanka: Role of seasonality |
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