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Ship observations and numerical simulation of the marine atmospheric boundary layer over the spring oceanic front in the northwestern South China Sea

The response of the marine atmospheric boundary layer (MABL) structure to an oceanic front is analyzed using Global Positioning System (GPS) sounding data obtained during a survey in the northwestern South China Sea (NSCS) over a period of about 1 week in April 2013. The Weather Research and Forecas... Full description

Journal Title: Journal of Geophysical Research: Atmospheres 16 April 2017, Vol.122(7), pp.3733-3753
Main Author: Shi, Rui
Other Authors: Chen, Ju , Guo, Xinyu , Zeng, Lili , Li, Jian , Xie, Qiang , Wang, Xin , Wang, Dongxiao
Format: Electronic Article Electronic Article
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ID: ISSN: 2169-897X ; E-ISSN: 2169-8996 ; DOI: 10.1002/2016JD026071
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recordid: wj10.1002/2016JD026071
title: Ship observations and numerical simulation of the marine atmospheric boundary layer over the spring oceanic front in the northwestern South China Sea
format: Article
creator:
  • Shi, Rui
  • Chen, Ju
  • Guo, Xinyu
  • Zeng, Lili
  • Li, Jian
  • Xie, Qiang
  • Wang, Xin
  • Wang, Dongxiao
subjects:
  • South China Sea Front
  • Marine Atmospheric Boundary Layer
  • Wrf Model
  • Synoptic Air‐Sea Coupling
ispartof: Journal of Geophysical Research: Atmospheres, 16 April 2017, Vol.122(7), pp.3733-3753
description: The response of the marine atmospheric boundary layer (MABL) structure to an oceanic front is analyzed using Global Positioning System (GPS) sounding data obtained during a survey in the northwestern South China Sea (NSCS) over a period of about 1 week in April 2013. The Weather Research and Forecasting (WRF) model is used to further examine the thermodynamical mechanisms of the MABL's response to the front. The WRF model successfully simulates the change in the MABL structure across the front, which agrees well with the observations. The spatially high‐pass‐filtered fields of sea surface temperature (SST) and 10 m neutral equivalent wind from the WRF model simulation show a tight, positive coupling between the SST and surface winds near the front. Meanwhile, the SST front works as a damping zone to reduce the enhancement of wind blowing from the warm to the cold side of the front in the lower boundary layer. Analysis of the momentum budget shows that the most active and significant term affecting horizontal momentum over the frontal zone is the adjustment of the pressure gradient. It is found that the front in the NSCS is wide enough for slowly moving air parcels to be affected by the change in underlying SST. The different thermal structure upwind and downwind of the front causes a baroclinic adjustment of the perturbation pressure from the surface to the midlayer of the MABL, which dominates the change in the wind profile across the front. SST anomalies associated with front regulate the vertical structure of MABL SST front weakens the acceleration of wind blowing at the opposite direction of SST gradient Pressure gradient is the primary factor to modify the cross front wind in MABL
language:
source:
identifier: ISSN: 2169-897X ; E-ISSN: 2169-8996 ; DOI: 10.1002/2016JD026071
fulltext: fulltext
issn:
  • 2169-897X
  • 2169897X
  • 2169-8996
  • 21698996
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titleShip observations and numerical simulation of the marine atmospheric boundary layer over the spring oceanic front in the northwestern South China Sea
creatorShi, Rui ; Chen, Ju ; Guo, Xinyu ; Zeng, Lili ; Li, Jian ; Xie, Qiang ; Wang, Xin ; Wang, Dongxiao
ispartofJournal of Geophysical Research: Atmospheres, 16 April 2017, Vol.122(7), pp.3733-3753
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subjectSouth China Sea Front ; Marine Atmospheric Boundary Layer ; Wrf Model ; Synoptic Air‐Sea Coupling
descriptionThe response of the marine atmospheric boundary layer (MABL) structure to an oceanic front is analyzed using Global Positioning System (GPS) sounding data obtained during a survey in the northwestern South China Sea (NSCS) over a period of about 1 week in April 2013. The Weather Research and Forecasting (WRF) model is used to further examine the thermodynamical mechanisms of the MABL's response to the front. The WRF model successfully simulates the change in the MABL structure across the front, which agrees well with the observations. The spatially high‐pass‐filtered fields of sea surface temperature (SST) and 10 m neutral equivalent wind from the WRF model simulation show a tight, positive coupling between the SST and surface winds near the front. Meanwhile, the SST front works as a damping zone to reduce the enhancement of wind blowing from the warm to the cold side of the front in the lower boundary layer. Analysis of the momentum budget shows that the most active and significant term affecting horizontal momentum over the frontal zone is the adjustment of the pressure gradient. It is found that the front in the NSCS is wide enough for slowly moving air parcels to be affected by the change in underlying SST. The different thermal structure upwind and downwind of the front causes a baroclinic adjustment of the perturbation pressure from the surface to the midlayer of the MABL, which dominates the change in the wind profile across the front. SST anomalies associated with front regulate the vertical structure of MABL SST front weakens the acceleration of wind blowing at the opposite direction of SST gradient Pressure gradient is the primary factor to modify the cross front wind in MABL
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titleShip observations and numerical simulation of the marine atmospheric boundary layer over the spring oceanic front in the northwestern South China Sea
descriptionThe response of the marine atmospheric boundary layer (MABL) structure to an oceanic front is analyzed using Global Positioning System (GPS) sounding data obtained during a survey in the northwestern South China Sea (NSCS) over a period of about 1 week in April 2013. The Weather Research and Forecasting (WRF) model is used to further examine the thermodynamical mechanisms of the MABL's response to the front. The WRF model successfully simulates the change in the MABL structure across the front, which agrees well with the observations. The spatially high‐pass‐filtered fields of sea surface temperature (SST) and 10 m neutral equivalent wind from the WRF model simulation show a tight, positive coupling between the SST and surface winds near the front. Meanwhile, the SST front works as a damping zone to reduce the enhancement of wind blowing from the warm to the cold side of the front in the lower boundary layer. Analysis of the momentum budget shows that the most active and significant term affecting horizontal momentum over the frontal zone is the adjustment of the pressure gradient. It is found that the front in the NSCS is wide enough for slowly moving air parcels to be affected by the change in underlying SST. The different thermal structure upwind and downwind of the front causes a baroclinic adjustment of the perturbation pressure from the surface to the midlayer of the MABL, which dominates the change in the wind profile across the front. SST anomalies associated with front regulate the vertical structure of MABL SST front weakens the acceleration of wind blowing at the opposite direction of SST gradient Pressure gradient is the primary factor to modify the cross front wind in MABL
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titleShip observations and numerical simulation of the marine atmospheric boundary layer over the spring oceanic front in the northwestern South China Sea
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abstractThe response of the marine atmospheric boundary layer (MABL) structure to an oceanic front is analyzed using Global Positioning System (GPS) sounding data obtained during a survey in the northwestern South China Sea (NSCS) over a period of about 1 week in April 2013. The Weather Research and Forecasting (WRF) model is used to further examine the thermodynamical mechanisms of the MABL's response to the front. The WRF model successfully simulates the change in the MABL structure across the front, which agrees well with the observations. The spatially high‐pass‐filtered fields of sea surface temperature (SST) and 10 m neutral equivalent wind from the WRF model simulation show a tight, positive coupling between the SST and surface winds near the front. Meanwhile, the SST front works as a damping zone to reduce the enhancement of wind blowing from the warm to the cold side of the front in the lower boundary layer. Analysis of the momentum budget shows that the most active and significant term affecting horizontal momentum over the frontal zone is the adjustment of the pressure gradient. It is found that the front in the NSCS is wide enough for slowly moving air parcels to be affected by the change in underlying SST. The different thermal structure upwind and downwind of the front causes a baroclinic adjustment of the perturbation pressure from the surface to the midlayer of the MABL, which dominates the change in the wind profile across the front. SST anomalies associated with front regulate the vertical structure of MABL SST front weakens the acceleration of wind blowing at the opposite direction of SST gradient Pressure gradient is the primary factor to modify the cross front wind in MABL
doi10.1002/2016JD026071
orcidid0000-0001-9618-127X
pages3733-3753
date2017-04-16