Zobrazit v EDS

Quantifying the Rightward Bias Extent of Tropical Cyclones' Cold Wakes.

Uloženo v:
Podrobná bibliografie
Název: Quantifying the Rightward Bias Extent of Tropical Cyclones' Cold Wakes.
Autoři: Ma, Zhanhong, Yan, Xinyue, Fei, Jianfang
Zdroj: Geophysical Research Letters; 9/16/2023, Vol. 50 Issue 17, p1-8, 8p
Témata: TROPICAL cyclones, POINT set theory, COMPUTER simulation
Abstrakt: Although the cold wake of tropical cyclones (TCs) is recognized to be typically rightward biased relative to TC track (in the North Hemisphere), it remains unclear to what extent the rightward bias should be for specified TCs. Based on numerical simulations and observational statistics, this study shows that the distance of cold wake rightward bias is closely related to latitude, translation speed and radius of maximum wind (RMW) of a TC, but is independent from maximum surface wind and radial wind profile outside the RMW, namely TC intensity and size. A semi‐empirical equation is derived to represent the rightward bias extent of cold wakes. For TCs with slower translation speed, smaller RMW, or at higher latitudes, the cold wakes are less asymmetric relative to the TC track. Atmospheric simulations also show that the TC tends to be weaker and more asymmetric as the cold wake is closer to TC center. Plain Language Summary: Tropical cyclones over the open ocean cause dramatic responses of the upper ocean, forming a long‐tailed sea surface cooling feature, often named as "cold wake." Satellite observations and numerical simulations suggest that the cold wake is typically rightward biased relative to the tropical cyclone (TC) track in the Northern Hemisphere. However, it remains unclear to what extent the rightward bias should be for specified TCs. Parameters setting the rightward bias extent of cold wakes are systematically quantified in this work. Results reveal that the rightward bias extent of cold wake depends on the translation speed and the radius of maximum wind of TCs, but is in independent from intensity and outer size of TCs. The asymmetric feature of cold wake could give feedback to the intensity and asymmetry of TCs effectively. Key Points: Parameters setting the rightward bias extent of cold wakes are systematically quantifiedThe rightward bias extent of cold wake depends on the radius of maximum wind but is independent from the intensity and outer size of tropical cyclones (TCs)The cold wake asymmetry influences TC intensity and asymmetry effectively [ABSTRACT FROM AUTHOR]
Copyright of Geophysical Research Letters is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Databáze: Complementary Index
Popis
Abstrakt:Although the cold wake of tropical cyclones (TCs) is recognized to be typically rightward biased relative to TC track (in the North Hemisphere), it remains unclear to what extent the rightward bias should be for specified TCs. Based on numerical simulations and observational statistics, this study shows that the distance of cold wake rightward bias is closely related to latitude, translation speed and radius of maximum wind (RMW) of a TC, but is independent from maximum surface wind and radial wind profile outside the RMW, namely TC intensity and size. A semi‐empirical equation is derived to represent the rightward bias extent of cold wakes. For TCs with slower translation speed, smaller RMW, or at higher latitudes, the cold wakes are less asymmetric relative to the TC track. Atmospheric simulations also show that the TC tends to be weaker and more asymmetric as the cold wake is closer to TC center. Plain Language Summary: Tropical cyclones over the open ocean cause dramatic responses of the upper ocean, forming a long‐tailed sea surface cooling feature, often named as "cold wake." Satellite observations and numerical simulations suggest that the cold wake is typically rightward biased relative to the tropical cyclone (TC) track in the Northern Hemisphere. However, it remains unclear to what extent the rightward bias should be for specified TCs. Parameters setting the rightward bias extent of cold wakes are systematically quantified in this work. Results reveal that the rightward bias extent of cold wake depends on the translation speed and the radius of maximum wind of TCs, but is in independent from intensity and outer size of TCs. The asymmetric feature of cold wake could give feedback to the intensity and asymmetry of TCs effectively. Key Points: Parameters setting the rightward bias extent of cold wakes are systematically quantifiedThe rightward bias extent of cold wake depends on the radius of maximum wind but is independent from the intensity and outer size of tropical cyclones (TCs)The cold wake asymmetry influences TC intensity and asymmetry effectively [ABSTRACT FROM AUTHOR]
ISSN:00948276
DOI:10.1029/2023GL104578