Have Tropical Cyclones Been Feeding More Extreme Rainfall?
We have conducted a study of the relationship between tropical cyclone (TC) and extreme rain events using GPCP and TRMM rainfall data, and storm track data for July through November (JASON) in the North Atlantic (NAT) and the western North Pacific (WNP). Extreme rain events are defined in terms of p...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20080040743 2023-05-15T17:34:43+02:00 Have Tropical Cyclones Been Feeding More Extreme Rainfall? Wu, H.-T. Lau, K.-M. Zhou, Y. P. Unclassified, Unlimited, Publicly available [2008] application/pdf http://hdl.handle.net/2060/20080040743 unknown Document ID: 20080040743 http://hdl.handle.net/2060/20080040743 Copyright, Distribution as joint owner in the copyright CASI Meteorology and Climatology 2008 ftnasantrs 2018-06-09T22:59:04Z We have conducted a study of the relationship between tropical cyclone (TC) and extreme rain events using GPCP and TRMM rainfall data, and storm track data for July through November (JASON) in the North Atlantic (NAT) and the western North Pacific (WNP). Extreme rain events are defined in terms of percentile rainrate, and TC-rain by rainfall associated with a named TC. Results show that climatologically, 8% of rain events and 17% of the total rain amount in NAT are accounted by TCs, compared to 9% of rain events and 21% of rain amount in WNP. The fractional contribution of accumulated TC-rain to total rain, Omega, increases nearly linearly as a function of rainrate. Extending the analyses using GPCP pentad data for 1979-2005, and for the post-SSM/I period (1988-2005), we find that while there is no significant trend in the total JASON rainfall over NAT or WNP, there is a positive significant trend in heavy rain over both basins for the 1979-2005 period, but not for the post-SSM/I period. Trend analyses of Omega for both periods indicate that TCs have been feeding increasingly more to rainfall extremes in NAT, where the expansion of the warm pool area can explain slight more than 50% of the change in observed trend in total TC rainfall. In WNP, trend signals for Omega are mixed, and the long-term relationship between TC rain and warm pool areas are strongly influenced by interannual and interdecadal variability. Other/Unknown Material North Atlantic NASA Technical Reports Server (NTRS) Pacific |
institution |
Open Polar |
collection |
NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
Meteorology and Climatology |
spellingShingle |
Meteorology and Climatology Wu, H.-T. Lau, K.-M. Zhou, Y. P. Have Tropical Cyclones Been Feeding More Extreme Rainfall? |
topic_facet |
Meteorology and Climatology |
description |
We have conducted a study of the relationship between tropical cyclone (TC) and extreme rain events using GPCP and TRMM rainfall data, and storm track data for July through November (JASON) in the North Atlantic (NAT) and the western North Pacific (WNP). Extreme rain events are defined in terms of percentile rainrate, and TC-rain by rainfall associated with a named TC. Results show that climatologically, 8% of rain events and 17% of the total rain amount in NAT are accounted by TCs, compared to 9% of rain events and 21% of rain amount in WNP. The fractional contribution of accumulated TC-rain to total rain, Omega, increases nearly linearly as a function of rainrate. Extending the analyses using GPCP pentad data for 1979-2005, and for the post-SSM/I period (1988-2005), we find that while there is no significant trend in the total JASON rainfall over NAT or WNP, there is a positive significant trend in heavy rain over both basins for the 1979-2005 period, but not for the post-SSM/I period. Trend analyses of Omega for both periods indicate that TCs have been feeding increasingly more to rainfall extremes in NAT, where the expansion of the warm pool area can explain slight more than 50% of the change in observed trend in total TC rainfall. In WNP, trend signals for Omega are mixed, and the long-term relationship between TC rain and warm pool areas are strongly influenced by interannual and interdecadal variability. |
author |
Wu, H.-T. Lau, K.-M. Zhou, Y. P. |
author_facet |
Wu, H.-T. Lau, K.-M. Zhou, Y. P. |
author_sort |
Wu, H.-T. |
title |
Have Tropical Cyclones Been Feeding More Extreme Rainfall? |
title_short |
Have Tropical Cyclones Been Feeding More Extreme Rainfall? |
title_full |
Have Tropical Cyclones Been Feeding More Extreme Rainfall? |
title_fullStr |
Have Tropical Cyclones Been Feeding More Extreme Rainfall? |
title_full_unstemmed |
Have Tropical Cyclones Been Feeding More Extreme Rainfall? |
title_sort |
have tropical cyclones been feeding more extreme rainfall? |
publishDate |
2008 |
url |
http://hdl.handle.net/2060/20080040743 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
CASI |
op_relation |
Document ID: 20080040743 http://hdl.handle.net/2060/20080040743 |
op_rights |
Copyright, Distribution as joint owner in the copyright |
_version_ |
1766133633522860032 |