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Using land-based stations for air-sea interaction studies

Rutgersson, Anna and Pettersson, Heidi and Nilsson, Erik and Bergström, Hans and Wallin, Marcus and Nilsson, E. Douglas and Sahlée, Erik and Wu, Lichuan and Mårtensson, E. Monica (2020). Using land-based stations for air-sea interaction studies. Tellus A: Dynamic Meteorology and Oceanography. 72 , 1-23
[Research article]

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Abstract

In situ measurements representing the marine atmosphere and air–sea interaction are taken at ships, buoys, stationary moorings and land-based towers, where each observation platform has structural restrictions. Air–sea fluxes are often small, and due to the limitations of the sensors, several corrections are applied. Land-based towers are convenient for long-term observations, but one critical aspect is the representativeness of marine conditions. Hence, a careful analysis of the sites and the data is necessary. Based on the concept of flux footprint, we suggest defining flux data from land-based marine micrometeorological sites in categories depending on the type of land influence: 1. CAT1: Marine data representing open sea, 2. CAT2: Disturbed wave field resulting in physical properties different from open sea conditions and heterogeneity of water properties in the footprint region, and 3. CAT3: Mixed land–sea footprint, very heterogeneous conditions and possible active carbon production/consumption. Characterization of data would be beneficial for combined analyses using several sites in coastal and marginal seas and evaluation/comparison of properties and dynamics. Aerosol fluxes are a useful contribution to characterizing a marine micrometeorological field station; for most conditions, they change sign between land and sea sectors. Measured fluxes from the land-based marine station Ostergarnsholm are € used as an example of a land-based marine site to evaluate the categories and to present an example of differences between open sea and coastal conditions. At the Ostergarnsholm site the surface drag is larger for € CAT2 and CAT3 than for CAT1 when wind speed is below 10 m/s. The heat and humidity fluxes show a distinctive distinguished seasonal cycle; latent heat flux is larger for CAT2 and CAT3 compared to CAT1. The flux of carbon dioxide is large from the coastal and land–sea sectors, showing a large seasonal cycle and significant variability (compared to the open sea sector). Aerosol fluxes are partly dominated by sea spray emissions comparable to those observed at other open sea conditions.

Authors/Creators:Rutgersson, Anna and Pettersson, Heidi and Nilsson, Erik and Bergström, Hans and Wallin, Marcus and Nilsson, E. Douglas and Sahlée, Erik and Wu, Lichuan and Mårtensson, E. Monica
Title:Using land-based stations for air-sea interaction studies
Series Name/Journal:Tellus A: Dynamic Meteorology and Oceanography
Year of publishing :2020
Volume:72
Page range:1-23
Number of Pages:23
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Meteorology and Atmospheric Sciences
(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Oceanography, Hydrology, Water Resources
Keywords:air–sea interaction, coastal zone, carbon dioxide, micrometeorological measurements, sea spray
URN:NBN:urn:nbn:se:slu:epsilon-p-108817
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-108817
Additional ID:
Type of IDID
DOI10.1080/16000870.2019.1697601
ID Code:19044
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Deposited By: SLUpub Connector
Deposited On:30 Nov 2020 10:43
Metadata Last Modified:15 Jan 2021 19:46

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