Next Article in Journal
Seasonal Forecasting of the Onset of the Rainy Season in West Africa
Previous Article in Journal
GIS Application for Determining Geographical Factors on Intensity of Erosion in Serbian River Basins. Case Study: The River Basin of Likodra
Previous Article in Special Issue
Spatial Predictability of Heavy Rainfall Events in East China and the Application of Spatial-Based Methods of Probabilistic Forecasting
Open AccessArticle

The Role of Background Wind and Moisture in the Atmospheric Response to Oceanic Eddies During Winter in the Kuroshio Extension Region

1
Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100, China
2
Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266100, China
3
Goldwind Science and Technology Co., Ltd., Beijing 100176, China
*
Author to whom correspondence should be addressed.
Atmosphere 2019, 10(9), 527; https://doi.org/10.3390/atmos10090527
Received: 8 August 2019 / Revised: 24 August 2019 / Accepted: 5 September 2019 / Published: 7 September 2019
(This article belongs to the Special Issue Advancements in Mesoscale Weather Analysis and Prediction)
The role of background wind and moisture in the atmospheric response to oceanic eddies during winter in the Kuroshio Extension (KE) region is examined by numerical experiments (EXPs) using the Weather Research and Forecasting (WRF) model. We designed two sets of parallel experiments (dry and wet EXPs). The dry EXPs exclude the moisture in the air and the evaporation process. Each experiment differs only in the background wind speed during the initial condition. The wet EXPs include humidity in the initial condition and evaporation during the integration; the other settings are the same as the dry EXPs. The atmosphere in the two sets of EXPs are forced by the same mesoscale sea surface temperature anomaly which resembles the oceanic warm eddy in KE region. The results of these EXPs confirm that under weak background wind conditions, the atmospheric secondary circulation over oceanic eddies is driven by the pressure adjustment process due to weak advection. In the case of the dry run, the increase in background wind enhances the sea surface wind (SSW) by increasing vertical mixing. The convergence of SSW induces vertical motion and heating in the boundary layer, which further decreases the instability. The atmospheric secondary circulation in the dry run remains within the boundary layer. In wet EXPs, the atmospheric response is similar to that in dry runs when the background wind is very weak. When the background wind speed is increased to the climatology value (in KE region) or higher, the vertical motion triggers the precipitation process and diabatic heating above the boundary layer, and the heating in turn reinforces the upward flow. View Full-Text
Keywords: mesoscale oceanic eddy; atmospheric response; Kuroshio extension region; background wind mesoscale oceanic eddy; atmospheric response; Kuroshio extension region; background wind
Show Figures

Figure 1

MDPI and ACS Style

Jia, Y.; Chen, L.; Liu, Q.; Yang, X.; Wu, Y. The Role of Background Wind and Moisture in the Atmospheric Response to Oceanic Eddies During Winter in the Kuroshio Extension Region. Atmosphere 2019, 10, 527.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop