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| Titel |
Global representation of tropical cyclone-induced short-term ocean thermal changes using Argo data |
| VerfasserIn |
L. Cheng, J. Zhu, R. L. Sriver |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 11, no. 5 ; Nr. 11, no. 5 (2015-09-18), S.719-741 |
| Datensatznummer |
250117290
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| Publikation (Nr.) |
 copernicus.org/os-11-719-2015.pdf |
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| Zusammenfassung |
| Argo floats are used to examine tropical cyclone (TC) induced ocean thermal
changes on the global scale by comparing temperature profiles before and
after TC passage. We present a footprint method that analyzes cross-track
thermal responses along all storm tracks during the period 2004–2012. We
combine the results into composite representations of the vertical structure
of the average thermal response for two different categories: tropical
storms/tropical depressions (TS/TD) and hurricanes. The two footprint
composites are functions of three variables: cross-track distance, water
depth and time relative to TC passage. We find that this footprint strategy
captures the major features of the upper-ocean thermal response to TCs on
timescales up to 20 days when compared against previous case study results
using in situ measurements. On the global scale, TCs are responsible for
1.87 PW (11.05 W m−2) of heat transfer annually from the global ocean
to the atmosphere during storm passage (0–3 days). Of this total,
1.05 ± 0.20 PW (4.80 ± 0.85 W m−2) is caused by TS/TD and
0.82 ± 0.21 PW (6.25 ± 1.5 W m−2) is caused by
hurricanes. Our findings indicate that ocean heat loss by TCs may be a
substantial missing piece of the global ocean heat budget. Changes in ocean
heat content (OHC) after storm passage are estimated by analyzing the
temperature anomalies during wake recovery following storm events (4–20 days
after storm passage) relative to pre-storm conditions. Results indicate the
global ocean experiences a 0.75 ± 0.25 PW
(5.98 ± 2.1 W m−2) heat gain annually for hurricanes. In
contrast, under TS/TD conditions, the ocean experiences 0.41 ± 0.21 PW
(1.90 ± 0.96 W m−2) ocean heat loss, suggesting the overall
oceanic thermal response is particularly sensitive to the intensity of the
event. The ocean heat uptake caused by all storms during the restorative
stage is 0.34 PW. |
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