Varying partitioning of surface turbulent fluxes regulates temperature‐humidity dissimilarity in the convective atmospheric boundary layer

2021 ◽  
Author(s):  
Cheng Liu ◽  
Heping Liu ◽  
Jianping Huang ◽  
Hongwei Xiao
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Turbulent Fluxes

scholarly journals The new BELUGA setup for collocated turbulence and radiation measurements using a tethered balloon: first applications in the cloudy Arctic boundary layer

2019 ◽  
Vol 12 (7) ◽  
pp. 4019-4038 ◽  
Author(s):  
Ulrike Egerer ◽  
Matthias Gottschalk ◽  
Holger Siebert ◽  
André Ehrlich ◽  
Manfred Wendisch
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Turbulent Fluxes ◽  
Lower Atmosphere ◽  
The Arctic ◽  
Radiative Cooling ◽  
Illustrative Case ◽  
Tethered Balloon ◽  
Arctic Boundary Layer ◽  
Radiation Measurements

Abstract. The new BELUGA (Balloon-bornE moduLar Utility for profilinG the lower Atmosphere) tethered balloon system is introduced. It combines a set of instruments to measure turbulent and radiative parameters and energy fluxes. BELUGA enables collocated measurements either at a constant altitude or as vertical profiles up to 1.5 km in height. In particular, the instrument payload of BELUGA comprises three modular instrument packages for high-resolution meteorological, wind vector and broadband radiation measurements. Collocated data acquisition allows for estimates of the driving parameters in the energy balance at various heights. Heating rates and net irradiances can be related to turbulent fluxes and local turbulence parameters such as dissipation rates. In this paper the technical setup, the instrument performance, and the measurement strategy of BELUGA are explained. Furthermore, the high vertical resolution due to the slow ascent speed is highlighted as a major advantage of tethered balloon-borne observations. Three illustrative case studies of the first application of BELUGA in the Arctic atmospheric boundary layer are presented. As a first example, measurements of a single-layer stratocumulus are discussed. They show a pronounced cloud top radiative cooling of up to 6 K h−1. To put this into context, a second case elaborates respective measurements with BELUGA in a cloudless situation. In a third example, a multilayer stratocumulus was probed, revealing reduced turbulence and negligible cloud top radiative cooling for the lower cloud layer. In all three cases the net radiative fluxes are much higher than turbulent fluxes. Altogether, BELUGA has proven its robust performance in cloudy conditions of the Arctic atmospheric boundary layer.

scholarly journals CheapAML: A Simple, Atmospheric Boundary Layer Model for Use in Ocean-Only Model Calculations

2013 ◽  
Vol 141 (2) ◽  
pp. 809-821 ◽  
Author(s):  
Bruno Deremble ◽  
N. Wienders ◽  
W. K. Dewar
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Wind Field ◽  
Turbulent Fluxes ◽  
Test Cases ◽  
Marine Atmospheric Boundary Layer ◽  
Layer Model ◽  
Global Modeling ◽  
Model Calculations ◽  
Radiative Fluxes

Abstract A model of the marine atmospheric boundary layer is developed for ocean-only modeling in order to better represent air–sea exchanges. This model computes the evolution of the atmospheric boundary layer temperature and humidity using a prescribed wind field. These quantities react to the underlying ocean through turbulent and radiative fluxes. With two examples, the authors illustrate that this formulation is accurate for regional and global modeling purposes and that turbulent fluxes are well reproduced in test cases when compared to reanalysis products. The model builds upon and is an extension of Seager et al.

Representing intermittency in turbulent fluxes: An application to the stable atmospheric boundary layer

2005 ◽  
Vol 354 ◽  
pp. 88-94 ◽  
Author(s):  
Haroldo F. Campos Velho ◽  
Reinaldo R. Rosa ◽  
Fernando M. Ramos ◽  
Roger A. Pielke Sr ◽  
Gervásio A. Degrazia
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Turbulent Fluxes ◽  
Stable Atmospheric Boundary Layer

scholarly journals The new BELUGA setup for collocated turbulence and radiation measurements using a tethered balloon: First applications in the cloudy Arctic boundary layer

2019 ◽  
Author(s):  
Ulrike Egerer ◽  
Matthias Gottschalk ◽  
Holger Siebert ◽  
André Ehrlich ◽  
Manfred Wendisch
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Turbulent Fluxes ◽  
Lower Atmosphere ◽  
The Arctic ◽  
Radiative Cooling ◽  
Illustrative Case ◽  
Tethered Balloon ◽  
Arctic Boundary Layer ◽  
Radiation Measurements

Abstract. The new BELUGA (Balloon-bornE moduLar Utility for profilinG the lower Atmosphere) tethered balloon system is introduced. It combines a set of instruments to measure turbulent and radiative parameters and energy fluxes. BELUGA enables collocated measurements either at a constant altitude or as vertical profiles up to 1.5 km height. In particular, the instrument payload of BELUGA comprises three modular instrument packages for high resolution meteorological, wind vector and broadband radiation measurements. The collocated data acquisition allows to estimate the driving parameters of the energy balance in various altitudes. Heating rates and net irradiances can be related to turbulent fluxes and local turbulence parameters such as dissipation rates. In this paper the technical setup, the instrument performance, and the measurement strategy of BELUGA are explained. Furthermore, the high vertical resolution due to the slow ascent speed is highlighted as a major advantage of tethered balloon-borne observations. Three illustrative case studies of the first application of BELUGA in the Arctic atmospheric boundary layer are presented. As a first example, measurements of a single layer stratocumulus are discussed. They show a pronounced cloud top radiative cooling of up to 6 K h−1. To put this into context, a second case elaborates respective measurements with BELUGA in a cloudless situation. In a third example, a multi layer stratocumulus was probed, revealing reduced turbulence and negligible cloud top radiative cooling for the lower cloud layer. In all three cases the net radiative fluxes are much higher than turbulent fluxes. Altogether, BELUGA has proven its robust performance in cloudy conditions of the Arctic atmospheric boundary layer.

Characteristics of the Night and Day Time Atmospheric Boundary Layer at Dome C, Antarctica

2007 ◽  
Vol 25 ◽  
pp. 49-55 ◽  
Author(s):  
S. Argentini ◽  
I. Pietroni ◽  
G. Mastrantonio ◽  
A. Viola ◽  
S. Zilitinchevich
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Night And Day
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