Annual Variation in Event-Scale Precipitation Δ 2 H at Barrow, Ak, Reflects Vapor Source Region
In this study, precipitation isotopic variations at Barrow, AK, USA, are linked to conditions at the moisture source region, along the transport path, and at the precipita- tion site. Seventy precipitation events between January 2009 and March 2013 were analyzed for δ2H and deuterium ex- cess. For e...
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ftdartmouthcoll:oai:digitalcommons.dartmouth.edu:facoa-3546 2023-07-16T03:57:07+02:00 Annual Variation in Event-Scale Precipitation Δ 2 H at Barrow, Ak, Reflects Vapor Source Region Putman, Annie Feng, Xiahong Sonder, Leslie Posmentier, Eric 2017-04-07T07:00:00Z application/pdf https://digitalcommons.dartmouth.edu/facoa/2539 https://digitalcommons.dartmouth.edu/context/facoa/article/3546/viewcontent/acp_17_4627_2017.pdf unknown Dartmouth Digital Commons https://digitalcommons.dartmouth.edu/facoa/2539 https://digitalcommons.dartmouth.edu/context/facoa/article/3546/viewcontent/acp_17_4627_2017.pdf Dartmouth Scholarship Chemistry Environmental Chemistry Physical Sciences and Mathematics text 2017 ftdartmouthcoll 2023-06-28T10:43:47Z In this study, precipitation isotopic variations at Barrow, AK, USA, are linked to conditions at the moisture source region, along the transport path, and at the precipita- tion site. Seventy precipitation events between January 2009 and March 2013 were analyzed for δ2H and deuterium ex- cess. For each precipitation event, vapor source regions were identified with the hybrid single-particle Lagrangian inte- grated trajectory (HYSPLIT) air parcel tracking program in back-cast mode. The results show that the vapor source re- gion migrated annually, with the most distal (proximal) and southerly (northerly) vapor source regions occurring during the winter (summer). This may be related to equatorial ex- pansion and poleward contraction of the polar circulation cell and the extent of Arctic sea ice cover. Annual cycles of vapor source region latitude and δ2H in precipitation were in phase; depleted (enriched) δ2H values were associated with winter (summer) and distal (proximal) vapor source regions. Precipitation δ2H responded to variation in vapor source region as reflected by significant correlations betweenδ2H with the following three parameters: (1) total cooling between lifted condensation level (LCL) and precipitating cloud at Barrow, ????T cool , (2) meteorological conditions at the evaporation site quantified by 2 m dew point, T d, and (3) whether the vapor transport path crossed the Brooks and/or Alaskan ranges, expressed as a Boolean variable, mt n. These three variables explained 54 % of the variance (p<0.001) in precipitation δ2H with a sensitivity of −3.51 ± 0.55 ‰ ◦C−1(p<0.001) to ????T cool, 3.23 ± 0.83 ‰ ◦C−1 (p<0.001) to Td, and −32.11 ± 11.04 ‰ (p = 0.0049) depletion when mt n is true. Text Arctic Sea ice Dartmouth Digital Commons (Dartmouth College) Arctic |
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Chemistry Environmental Chemistry Physical Sciences and Mathematics |
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Chemistry Environmental Chemistry Physical Sciences and Mathematics Putman, Annie Feng, Xiahong Sonder, Leslie Posmentier, Eric Annual Variation in Event-Scale Precipitation Δ 2 H at Barrow, Ak, Reflects Vapor Source Region |
topic_facet |
Chemistry Environmental Chemistry Physical Sciences and Mathematics |
description |
In this study, precipitation isotopic variations at Barrow, AK, USA, are linked to conditions at the moisture source region, along the transport path, and at the precipita- tion site. Seventy precipitation events between January 2009 and March 2013 were analyzed for δ2H and deuterium ex- cess. For each precipitation event, vapor source regions were identified with the hybrid single-particle Lagrangian inte- grated trajectory (HYSPLIT) air parcel tracking program in back-cast mode. The results show that the vapor source re- gion migrated annually, with the most distal (proximal) and southerly (northerly) vapor source regions occurring during the winter (summer). This may be related to equatorial ex- pansion and poleward contraction of the polar circulation cell and the extent of Arctic sea ice cover. Annual cycles of vapor source region latitude and δ2H in precipitation were in phase; depleted (enriched) δ2H values were associated with winter (summer) and distal (proximal) vapor source regions. Precipitation δ2H responded to variation in vapor source region as reflected by significant correlations betweenδ2H with the following three parameters: (1) total cooling between lifted condensation level (LCL) and precipitating cloud at Barrow, ????T cool , (2) meteorological conditions at the evaporation site quantified by 2 m dew point, T d, and (3) whether the vapor transport path crossed the Brooks and/or Alaskan ranges, expressed as a Boolean variable, mt n. These three variables explained 54 % of the variance (p<0.001) in precipitation δ2H with a sensitivity of −3.51 ± 0.55 ‰ ◦C−1(p<0.001) to ????T cool, 3.23 ± 0.83 ‰ ◦C−1 (p<0.001) to Td, and −32.11 ± 11.04 ‰ (p = 0.0049) depletion when mt n is true. |
format |
Text |
author |
Putman, Annie Feng, Xiahong Sonder, Leslie Posmentier, Eric |
author_facet |
Putman, Annie Feng, Xiahong Sonder, Leslie Posmentier, Eric |
author_sort |
Putman, Annie |
title |
Annual Variation in Event-Scale Precipitation Δ 2 H at Barrow, Ak, Reflects Vapor Source Region |
title_short |
Annual Variation in Event-Scale Precipitation Δ 2 H at Barrow, Ak, Reflects Vapor Source Region |
title_full |
Annual Variation in Event-Scale Precipitation Δ 2 H at Barrow, Ak, Reflects Vapor Source Region |
title_fullStr |
Annual Variation in Event-Scale Precipitation Δ 2 H at Barrow, Ak, Reflects Vapor Source Region |
title_full_unstemmed |
Annual Variation in Event-Scale Precipitation Δ 2 H at Barrow, Ak, Reflects Vapor Source Region |
title_sort |
annual variation in event-scale precipitation δ 2 h at barrow, ak, reflects vapor source region |
publisher |
Dartmouth Digital Commons |
publishDate |
2017 |
url |
https://digitalcommons.dartmouth.edu/facoa/2539 https://digitalcommons.dartmouth.edu/context/facoa/article/3546/viewcontent/acp_17_4627_2017.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Sea ice |
genre_facet |
Arctic Sea ice |
op_source |
Dartmouth Scholarship |
op_relation |
https://digitalcommons.dartmouth.edu/facoa/2539 https://digitalcommons.dartmouth.edu/context/facoa/article/3546/viewcontent/acp_17_4627_2017.pdf |
_version_ |
1771543631776186368 |