Arctic Summer Airmass Transformation, Surface Inversions, and the Surface Energy BudgetSource: Journal of Climate:;2018:;volume 032:;issue 003::page 769Author:Tjernström, Michael
,
Shupe, Matthew D.
,
Brooks, Ian M.
,
Achtert, Peggy
,
Prytherch, John
,
Sedlar, Joseph
DOI: 10.1175/JCLI-D-18-0216.1Publisher: American Meteorological Society
Abstract: During the Arctic Clouds in Summer Experiment (ACSE) in summer 2014 a weeklong period of warm-air advection over melting sea ice, with the formation of a strong surface temperature inversion and dense fog, was observed. Based on an analysis of the surface energy budget, we formulated the hypothesis that, because of the airmass transformation, additional surface heating occurs during warm-air intrusions in a zone near the ice edge. To test this hypothesis, we explore all cases with surface inversions occurring during ACSE and then characterize the inversions in detail. We find that they always occur with advection from the south and are associated with subsidence. Analyzing only inversion cases over sea ice, we find two categories: one with increasing moisture in the inversion and one with constant or decreasing moisture with height. During surface inversions with increasing moisture with height, an extra 10?25 W m?2 of surface heating was observed, compared to cases without surface inversions; the surface turbulent heat flux was the largest single term. Cases with less moisture in the inversion were often cloud free and the extra solar radiation plus the turbulent surface heat flux caused by the inversion was roughly balanced by the loss of net longwave radiation.
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contributor author | Tjernström, Michael | |
contributor author | Shupe, Matthew D. | |
contributor author | Brooks, Ian M. | |
contributor author | Achtert, Peggy | |
contributor author | Prytherch, John | |
contributor author | Sedlar, Joseph | |
date accessioned | 2019-09-22T09:04:18Z | |
date available | 2019-09-22T09:04:18Z | |
date copyright | 11/29/2018 12:00:00 AM | |
date issued | 2018 | |
identifier other | JCLI-D-18-0216.1.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl1/handle/yetl/4262737 | |
description abstract | During the Arctic Clouds in Summer Experiment (ACSE) in summer 2014 a weeklong period of warm-air advection over melting sea ice, with the formation of a strong surface temperature inversion and dense fog, was observed. Based on an analysis of the surface energy budget, we formulated the hypothesis that, because of the airmass transformation, additional surface heating occurs during warm-air intrusions in a zone near the ice edge. To test this hypothesis, we explore all cases with surface inversions occurring during ACSE and then characterize the inversions in detail. We find that they always occur with advection from the south and are associated with subsidence. Analyzing only inversion cases over sea ice, we find two categories: one with increasing moisture in the inversion and one with constant or decreasing moisture with height. During surface inversions with increasing moisture with height, an extra 10?25 W m?2 of surface heating was observed, compared to cases without surface inversions; the surface turbulent heat flux was the largest single term. Cases with less moisture in the inversion were often cloud free and the extra solar radiation plus the turbulent surface heat flux caused by the inversion was roughly balanced by the loss of net longwave radiation. | |
publisher | American Meteorological Society | |
title | Arctic Summer Airmass Transformation, Surface Inversions, and the Surface Energy Budget | |
type | Journal Paper | |
journal volume | 32 | |
journal issue | 3 | |
journal title | Journal of Climate | |
identifier doi | 10.1175/JCLI-D-18-0216.1 | |
journal fristpage | 769 | |
journal lastpage | 789 | |
tree | Journal of Climate:;2018:;volume 032:;issue 003 | |
contenttype | Fulltext |