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Tropospheric Vertical Column Densities of No2 Over Managed Dryland Ecosystems (Xinjiang, China): Max-doas Measurements Vs. 3-d Dispersion Model Simulations Based on Laboratory Derived No Emission from Soil Samples : Volume 14, Issue 13 (28/07/2014)

By Mamtimin, B.

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Book Id: WPLBN0003972583
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File Size: Pages 38
Reproduction Date: 2015

Title: Tropospheric Vertical Column Densities of No2 Over Managed Dryland Ecosystems (Xinjiang, China): Max-doas Measurements Vs. 3-d Dispersion Model Simulations Based on Laboratory Derived No Emission from Soil Samples : Volume 14, Issue 13 (28/07/2014)  
Author: Mamtimin, B.
Volume: Vol. 14, Issue 13
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Behrendt, T., Badawy, M. M., Wu, Z., Meixner, F. X., Mamtimin, B., Qi, Y., & Wagner, T. (2014). Tropospheric Vertical Column Densities of No2 Over Managed Dryland Ecosystems (Xinjiang, China): Max-doas Measurements Vs. 3-d Dispersion Model Simulations Based on Laboratory Derived No Emission from Soil Samples : Volume 14, Issue 13 (28/07/2014). Retrieved from

Description: Biogeochemistry Department, Max Planck Institute for Chemistry, Mainz, Germany. We report on MAX-DOAS observations of NO2 over an oasis-ecotone-desert ecosystem in NW-China. There, local ambient NO2 concentrations originate from enhanced biogenic NO emission of intensively managed soils. Our target oasis Milan is located at the southern edge of the Taklimakan desert, very remote and well isolated from other potential anthropogenic and biogenic NOx sources. Four observation sites for MAX-DOAS measurements were selected, at the oasis center, downwind and upwind of the oasis, and in the desert. Biogenic NO emissions in terms of (i) soil moisture and (ii) soil temperature of Milan oasis' (iii) different land-cover type sub-units (cotton, Jujube trees, cotton/Jujube mixture, desert) were quantified by laboratory incubation of corresponding soil samples. Net potential NO fluxes were up-scaled to oasis scale by areal distribution and classification of land-cover types derived from satellite images using GIS techniques. A Lagrangian dispersion model (LASAT, Lagrangian Simulation of Aerosol-Transport) was used to calculate the dispersion of soil emitted NO into the atmospheric boundary layer over Milan oasis. Three dimensional NO concentrations (30 m horizontal resolution) have been converted to 3-D NO2 concentrations, assuming photostationary state conditions. NO2 column densities were simulated by suitable vertical integration of modeled 3-D NO2 concentrations at those downwind and upwind locations, where the MAX-DOAS measurements were performed. Downwind-upwind differences (a direct measure of Milan oasis' contribution to the areal increase of ambient NO2 concentration) of measured and simulated slant (as well as vertical) NO2 column densities show excellent agreement. This agreement is considered as the first successful attempt to prove the validity of the chosen approach to up-scale laboratory derived biogenic NO fluxes to ecosystem field conditions, i.e. from the spatial scale of a soil sample (cm2) to the size of an entire agricultural ecosystem (km2).

Tropospheric vertical column densities of NO2 over managed dryland ecosystems (Xinjiang, China): MAX-DOAS measurements vs. 3-D dispersion model simulations based on laboratory derived NO emission from soil samples

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