Impacts of Midlatitude Western North Pacific Sea Surface Temperature Anomaly on the Subseasonal to Seasonal Tropical Cyclone Activity: Case Study of the 2018 Boreal Summer

Nasuno, Tomoe; Nakano, Masuo; Murakami, Hiroyuki; Kikuchi, Kazuyoshi; Yamada, Yohei

doi:10.2151/sola.2022-015

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Impacts of Midlatitude Western North Pacific Sea Surface Temperature Anomaly on the Subseasonal to Seasonal Tropical Cyclone Activity: Case Study of the 2018 Boreal Summer

2022
By Nasuno, Tomoe ; Nakano, Masuo ; Murakami, Hiroyuki ; ...
Source: SOLA, 18(0), 88-95

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Journal Title:

SOLA
Personal Author:

Nasuno, Tomoe ; Nakano, Masuo ; Murakami, Hiroyuki ; Kikuchi, Kazuyoshi ; Yamada, Yohei

Nasuno, Tomoe ; Nakano, Masuo ; Murakami, Hiroyuki ; Kikuchi, Kazuyoshi ; Yamada, Yohei Less -
NOAA Program & Office:

GFDL (Geophysical Fluid Dynamics Laboratory) ; OAR (Oceanic and Atmospheric Research)

GFDL (Geophysical Fluid Dynamics Laboratory) ; OAR (Oceanic and Atmospheric Research) Less -
Description:

In this study, we explored the impacts of midlatitude western North Pacific (WNP) sea surface temperature (SST) on tropical cyclone (TC) activity at intraseasonal to seasonal time scales during the 2018 boreal summer. During this period, a positive SST anomaly occurred in the midlatitude WNP and subtropical central Pacific; TC activity was abnormally high under the influence of the strong Asian summer monsoon. We performed sensitivity experiments using a global cloud system-resolving model for global SST (control, CTL) and SST that were regionally restored according to midlatitude WNP climatology (MWNPCLM). TC track density in the eastern WNP was higher in CTL than in MWNPCLM, in association with large-scale atmospheric responses; enhanced monsoon westerlies in the subtropical WNP, moist rising (dry subsiding) tendencies, and reduced (enhanced) vertical wind shear in the eastern (western) WNP. Enhanced TC activity in the eastern WNP was more distinct for intense TCs and during the active phase of intraseasonal oscillation (ISO). These results suggest that the impacts of midlatitude SST anomalies can reach lower latitudes to affect TC activity via large-scale atmospheric responses and ISO, which are usually overwhelmed by the impacts of SST anomalies in the tropics and subtropics.
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Atmospheric Science
Source:

SOLA, 18(0), 88-95
DOI:

https://doi.org/10.2151/sola.2022-015
ISSN:

1349-6476
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PDF
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Meteorological Society of Japan
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Journal Article
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https://creativecommons.org/licenses/by/4.0/
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CC BY
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urn:sha-512:8716293201bb47cfb68cafe5454e2816aef5fd98926f6ebc75d923681cf01f14b51b873c81aa3a37b565004bfe48cafd98441fea154ccb278844af18a93584b7
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Impacts of Midlatitude Western North Pacific Sea Surface Temperature Anomaly on the Subseasonal to Seasonal Tropical Cyclone Activity: Case Study of the 2018 Boreal Summer

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