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A Framework to Study Mixing Processes in the Marine Boundary Layer Using Water Vapor Isotope Measurements

A Framework to Study Mixing Processes in the Marine Boundary Layer Using Water Vapor Isotope Measurements


Title: A Framework to Study Mixing Processes in the Marine Boundary Layer Using Water Vapor Isotope Measurements
Author: Benetti, M.
Lacour, Jean-Lionel
Sveinbjörnsdóttir, Árný   orcid.org/0000-0002-0310-1283
Aloisi, G.
Reverdin, G.
Risi, C.
Peters, A. J.
Steen‐Larsen, H. C.
Date: 2018-03-10
Language: English
Scope: 2524-2532
University/Institute: Háskóli Íslands
University of Iceland
School: Verkfræði- og náttúruvísindasvið (HÍ)
School of Engineering and Natural Sciences (UI)
Department: Jarðvísindastofnun (HÍ)
Institute of Earth Sciences (UI)
Series: Geophysical Research Letters;45(5)
ISSN: 0094-8276
1944-8007 (eISSN)
DOI: 10.1002/2018GL077167
Subject: Geophysics; Marine boundary layer; Water vapor isotopes; Evaporation; Jarðeðlisfræði; Veðrahvolf; Norður-Atlantshaf; Vatnafræði; Samsætur
URI: https://hdl.handle.net/20.500.11815/2024

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Citation:

Benetti, M., Lacour, J.-L.,Sveinbjörnsdóttir, A. E., Aloisi, G.,Reverdin, G., Risi, C., et al. (2018). Aframework to study mixing processes inthe marine boundary layer using watervapor isotope measurements.Geophysical Research Letters, 45,2524–2532. https://doi.org/10.1002/2018GL077167

Abstract:

We propose a framework using water vapor isotopes to study mixing processes in the marine boundary layer (MBL) during quiescent conditions, where we expect evaporation to contribute to the moisture budget. This framework complements the existing models, by taking into account the changing isotopic composition of the evaporation flux (δe), both directly in response to the mixing and indirectly in response to mixing and surface conditions through variations in MBL humidity. The robustness of the model is demonstrated using measurements from the North Atlantic Ocean. This shows the importance of considering the δe variability simultaneous to the mixing of the lower free troposphere to the MBL, to simulate the MBL water vapor, whereas a mixing model using a constant δe fails to reproduce the data. The sensitivity of isotope observations to evaporation and shallow mixing further demonstrates how these observations can constrain uncertainties associated with these key processes for climate feedback predictions.

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©2018. American Geophysical Union. All Rights Reserved.

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