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Title: Ocean Barrier Layers in the Energy Exascale Earth System Model

Abstract

Ocean barrier layers (BLs) separate the mixed layer from the top of the thermocline and are able to insulate the mixed layer from entrainment of cold thermocline water. In this work, we provide the first global BL assessment in E3SMv1 and two other Earth system models. Compared to observations, models reproduce the global distributions as semipermanent features in some tropical regions and seasonal features elsewhere. Yet, model BLs are generally too thin in tropical regions and too thick in higher latitudes. BLs' ability to insulate the ocean surface from entrainment of cold thermocline water is most apparent in the tropics. Along these lines, E3SMv1s BL thickness biases most affect entrainment here. Tropical BLT biases appear driven by atmosphere biases, mainly through the effect of precipitation minus evaporation on mixed layer depth. At higher latitudes BL thickness biases are dominated by thermocline depth errors related to ocean circulation and vertical mixing.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [3]
  1. Univ. of Arizona, Tucson, AZ (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1557057
Alternate Identifier(s):
OSTI ID: 1545390; OSTI ID: 1558061
Report Number(s):
LLNL-JRNL-765557; LA-UR-19-20158
Journal ID: ISSN 0094-8276; 955593
Grant/Contract Number:  
AC52-07NA27344; 89233218CNA000001; SC0016533
Resource Type:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 46; Journal Issue: 14; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; E3SM; barrier layers; Earth Sciences

Citation Formats

Reeves Eyre, J. E. Jack, Van Roekel, Luke, Zeng, Xubin, Brunke, Michael A., and Golaz, Jean‐Christophe. Ocean Barrier Layers in the Energy Exascale Earth System Model. United States: N. p., 2019. Web. doi:10.1029/2019GL083591.
Reeves Eyre, J. E. Jack, Van Roekel, Luke, Zeng, Xubin, Brunke, Michael A., & Golaz, Jean‐Christophe. Ocean Barrier Layers in the Energy Exascale Earth System Model. United States. doi:10.1029/2019GL083591.
Reeves Eyre, J. E. Jack, Van Roekel, Luke, Zeng, Xubin, Brunke, Michael A., and Golaz, Jean‐Christophe. Thu . "Ocean Barrier Layers in the Energy Exascale Earth System Model". United States. doi:10.1029/2019GL083591.
@article{osti_1557057,
title = {Ocean Barrier Layers in the Energy Exascale Earth System Model},
author = {Reeves Eyre, J. E. Jack and Van Roekel, Luke and Zeng, Xubin and Brunke, Michael A. and Golaz, Jean‐Christophe},
abstractNote = {Ocean barrier layers (BLs) separate the mixed layer from the top of the thermocline and are able to insulate the mixed layer from entrainment of cold thermocline water. In this work, we provide the first global BL assessment in E3SMv1 and two other Earth system models. Compared to observations, models reproduce the global distributions as semipermanent features in some tropical regions and seasonal features elsewhere. Yet, model BLs are generally too thin in tropical regions and too thick in higher latitudes. BLs' ability to insulate the ocean surface from entrainment of cold thermocline water is most apparent in the tropics. Along these lines, E3SMv1s BL thickness biases most affect entrainment here. Tropical BLT biases appear driven by atmosphere biases, mainly through the effect of precipitation minus evaporation on mixed layer depth. At higher latitudes BL thickness biases are dominated by thermocline depth errors related to ocean circulation and vertical mixing.},
doi = {10.1029/2019GL083591},
journal = {Geophysical Research Letters},
number = 14,
volume = 46,
place = {United States},
year = {2019},
month = {6}
}

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