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Title: Effect of Secondary Circulations on the Surface–Atmosphere Exchange of Energy at an Isolated Semi-arid Forest

Abstract

Afforestation in semi-arid regions can potentially enhance the global carbon sink by increasing the terrestrial biomass. However, the survival of planted forests under such extreme environmental conditions is not guaranteed a priori, and critically depends on the surface–atmosphere exchange of energy. Here, we investigate the pine forest Yatir in Israel, an example of a man-made semi-arid ecosystem, by means of large-eddy simulations. We focus on the interaction between surface–atmosphere exchange and secondary circulations that couple the isolated forest to the surrounding shrubland. The large-eddy simulations feature a grid resolution that resolves the forest canopy in several layers, and are initialized by satellite data and Doppler lidar, eddy-covariance and radiosonde measurements. We perform three large-eddy simulations with different geostrophic wind speeds to investigate the influence of those wind speeds on the surface–atmosphere exchange. We reproduce the measured mean updrafts above the forest and mean downdrafts above the shrubland, which increase in strength with decreasing geostrophic wind speed. The largest updrafts emerge above the older, denser part of the forest, triggering secondary circulations. The spatial extent of these circulations does not cover the entire forest area, although we observe a reduced aerodynamic resistance in the regions of updraft. Our simulations indicate thatmore » the enhanced surface–atmosphere exchange of the Yatir forest is not sufficient to compensate for the increased net radiation, due to the lower albedo of the forest with respect to the surroundings, resulting in higher air temperatures inside the forest. However, the difference between the forest and shrubland temperatures decreases with increasing geostrophic wind speed due to reduction in the aerodynamic resistance.« less

Authors:
 [1];  [1];  [1];  [1]; ORCiD logo [2];  [1];  [3];  [3];  [3];  [1]
  1. Karlsruhe Inst. of Technology (KIT) Garmisch-Partenkirchen (Germany). Inst. of Meteorology and Climate Research, Atmospheric Environmental Research (IMK-IFU)
  2. Karlsruhe Inst. of Technology (KIT) Garmisch-Partenkirchen (Germany). Inst. of Meteorology and Climate Research, Atmospheric Environmental Research (IMK-IFU); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Weizmann Inst. of Science, Rehovot (Israel). Dept. of Earth and Planetary Sciences and Faculty of Chemistry
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE; German Research Foundation (DFG); Gauss Centre for Supercomputing (GCS), Garching (Germany). Leibniz Computing Centre of the Bavarian Academy of Sciences (LRZ); Helmholtz Association of German Research Centres
Contributing Org.:
Univ. of Hannover (Germany)
OSTI Identifier:
1467275
Report Number(s):
LA-UR-17-30829
Journal ID: ISSN 0006-8314
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Boundary-Layer Meteorology
Additional Journal Information:
Journal Volume: 169; Journal Issue: 2; Journal ID: ISSN 0006-8314
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; large-eddy simulation; canopy turbulence; aerodynamic resistance; secondary circulations; virtual canopy construction; Yatir forest

Citation Formats

Kröniger, Konstantin, De Roo, Frederik, Brugger, Peter, Huq, Sadiq, Banerjee, Tirtha, Zinsser, Judith, Rotenberg, Eyal, Yakir, Dan, Rohatyn, Shani, and Mauder, Matthias. Effect of Secondary Circulations on the Surface–Atmosphere Exchange of Energy at an Isolated Semi-arid Forest. United States: N. p., 2018. Web. doi:10.1007/s10546-018-0370-6.
Kröniger, Konstantin, De Roo, Frederik, Brugger, Peter, Huq, Sadiq, Banerjee, Tirtha, Zinsser, Judith, Rotenberg, Eyal, Yakir, Dan, Rohatyn, Shani, & Mauder, Matthias. Effect of Secondary Circulations on the Surface–Atmosphere Exchange of Energy at an Isolated Semi-arid Forest. United States. https://doi.org/10.1007/s10546-018-0370-6
Kröniger, Konstantin, De Roo, Frederik, Brugger, Peter, Huq, Sadiq, Banerjee, Tirtha, Zinsser, Judith, Rotenberg, Eyal, Yakir, Dan, Rohatyn, Shani, and Mauder, Matthias. Sat . "Effect of Secondary Circulations on the Surface–Atmosphere Exchange of Energy at an Isolated Semi-arid Forest". United States. https://doi.org/10.1007/s10546-018-0370-6. https://www.osti.gov/servlets/purl/1467275.
@article{osti_1467275,
title = {Effect of Secondary Circulations on the Surface–Atmosphere Exchange of Energy at an Isolated Semi-arid Forest},
author = {Kröniger, Konstantin and De Roo, Frederik and Brugger, Peter and Huq, Sadiq and Banerjee, Tirtha and Zinsser, Judith and Rotenberg, Eyal and Yakir, Dan and Rohatyn, Shani and Mauder, Matthias},
abstractNote = {Afforestation in semi-arid regions can potentially enhance the global carbon sink by increasing the terrestrial biomass. However, the survival of planted forests under such extreme environmental conditions is not guaranteed a priori, and critically depends on the surface–atmosphere exchange of energy. Here, we investigate the pine forest Yatir in Israel, an example of a man-made semi-arid ecosystem, by means of large-eddy simulations. We focus on the interaction between surface–atmosphere exchange and secondary circulations that couple the isolated forest to the surrounding shrubland. The large-eddy simulations feature a grid resolution that resolves the forest canopy in several layers, and are initialized by satellite data and Doppler lidar, eddy-covariance and radiosonde measurements. We perform three large-eddy simulations with different geostrophic wind speeds to investigate the influence of those wind speeds on the surface–atmosphere exchange. We reproduce the measured mean updrafts above the forest and mean downdrafts above the shrubland, which increase in strength with decreasing geostrophic wind speed. The largest updrafts emerge above the older, denser part of the forest, triggering secondary circulations. The spatial extent of these circulations does not cover the entire forest area, although we observe a reduced aerodynamic resistance in the regions of updraft. Our simulations indicate that the enhanced surface–atmosphere exchange of the Yatir forest is not sufficient to compensate for the increased net radiation, due to the lower albedo of the forest with respect to the surroundings, resulting in higher air temperatures inside the forest. However, the difference between the forest and shrubland temperatures decreases with increasing geostrophic wind speed due to reduction in the aerodynamic resistance.},
doi = {10.1007/s10546-018-0370-6},
journal = {Boundary-Layer Meteorology},
number = 2,
volume = 169,
place = {United States},
year = {Sat Jul 07 00:00:00 EDT 2018},
month = {Sat Jul 07 00:00:00 EDT 2018}
}

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Works referencing / citing this record:

Turbulent transport of energy across a forest and a semiarid shrubland
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