Direct observations of the effects of aerosol loading on net ecosystem CO2 exchanges over different landscapes

Dev Niyogi; Hsin I. Chang; V. K. Saxena; Teddy Holt; Kiran Alapaty; Fitzgerald Booker; Fei Chen; Kenneth J. Davis; Brent Holben; Toshihisa Matsui; Tilden Meyers; Walter C. Oechel; Roger A. Pielke; Randy Wells; Kell Wilson; Yongkang Xue

doi:10.1029/2004GL020915

Direct observations of the effects of aerosol loading on net ecosystem CO₂ exchanges over different landscapes

Dev Niyogi, Hsin I. Chang, V. K. Saxena, Teddy Holt, Kiran Alapaty, Fitzgerald Booker, Fei Chen, Kenneth J. Davis, Brent Holben, Toshihisa Matsui, Tilden Meyers, Walter C. Oechel, Roger A. Pielke, Randy Wells, Kell Wilson, Yongkang Xue

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191 Scopus citations

Abstract

We present the first direct, multisite observations in Support of the hypothesis that atmospheric aerosols affect the regional terrestrial carbon cycle. The daytime growing season (summer) CO₂ flux observations from six sites (forest, grasslands, and croplands) with collocated aerosol and surface radiation measurements were analyzed for high and low diffuse radiation; effect of cloud cover; and effect of high and low aerosol optical depths (AOD). Results indicate that, aerosols exert a significant impact on net CO₂ exchange, and their effect may be even more significant than that due to clouds. The response appears to be a general feature irrespective of the landscape and photosynthetic pathway. The CO₂ sink increased with aerosol loading for forest and crop lands, and decreased for grassland. The cause for the difference in response between vegetation types is hypothesized to be canopy architecture.

Original language	English (US)
Pages (from-to)	L20506 1-5
Journal	Geophysical Research Letters
Volume	31
Issue number	20
DOIs	https://doi.org/10.1029/2004GL020915
State	Published - Oct 28 2004

All Science Journal Classification (ASJC) codes

Geophysics
General Earth and Planetary Sciences

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Niyogi, D., Chang, H. I., Saxena, V. K., Holt, T., Alapaty, K., Booker, F., Chen, F., Davis, K. J., Holben, B., Matsui, T., Meyers, T., Oechel, W. C., Pielke, R. A., Wells, R., Wilson, K., & Xue, Y. (2004). Direct observations of the effects of aerosol loading on net ecosystem CO₂ exchanges over different landscapes. Geophysical Research Letters, 31(20), L20506 1-5. https://doi.org/10.1029/2004GL020915

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title = "Direct observations of the effects of aerosol loading on net ecosystem CO2 exchanges over different landscapes",

abstract = "We present the first direct, multisite observations in Support of the hypothesis that atmospheric aerosols affect the regional terrestrial carbon cycle. The daytime growing season (summer) CO2 flux observations from six sites (forest, grasslands, and croplands) with collocated aerosol and surface radiation measurements were analyzed for high and low diffuse radiation; effect of cloud cover; and effect of high and low aerosol optical depths (AOD). Results indicate that, aerosols exert a significant impact on net CO2 exchange, and their effect may be even more significant than that due to clouds. The response appears to be a general feature irrespective of the landscape and photosynthetic pathway. The CO2 sink increased with aerosol loading for forest and crop lands, and decreased for grassland. The cause for the difference in response between vegetation types is hypothesized to be canopy architecture.",

author = "Dev Niyogi and Chang, {Hsin I.} and Saxena, {V. K.} and Teddy Holt and Kiran Alapaty and Fitzgerald Booker and Fei Chen and Davis, {Kenneth J.} and Brent Holben and Toshihisa Matsui and Tilden Meyers and Oechel, {Walter C.} and Pielke, {Roger A.} and Randy Wells and Kell Wilson and Yongkang Xue",

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Niyogi, D, Chang, HI, Saxena, VK, Holt, T, Alapaty, K, Booker, F, Chen, F, Davis, KJ, Holben, B, Matsui, T, Meyers, T, Oechel, WC, Pielke, RA, Wells, R, Wilson, K & Xue, Y 2004, 'Direct observations of the effects of aerosol loading on net ecosystem CO₂ exchanges over different landscapes', Geophysical Research Letters, vol. 31, no. 20, pp. L20506 1-5. https://doi.org/10.1029/2004GL020915

TY - JOUR

T1 - Direct observations of the effects of aerosol loading on net ecosystem CO2 exchanges over different landscapes

AU - Niyogi, Dev

AU - Chang, Hsin I.

AU - Saxena, V. K.

AU - Holt, Teddy

AU - Alapaty, Kiran

AU - Booker, Fitzgerald

AU - Chen, Fei

AU - Davis, Kenneth J.

AU - Holben, Brent

AU - Matsui, Toshihisa

AU - Meyers, Tilden

AU - Oechel, Walter C.

AU - Pielke, Roger A.

AU - Wells, Randy

AU - Wilson, Kell

AU - Xue, Yongkang

PY - 2004/10/28

Y1 - 2004/10/28

N2 - We present the first direct, multisite observations in Support of the hypothesis that atmospheric aerosols affect the regional terrestrial carbon cycle. The daytime growing season (summer) CO2 flux observations from six sites (forest, grasslands, and croplands) with collocated aerosol and surface radiation measurements were analyzed for high and low diffuse radiation; effect of cloud cover; and effect of high and low aerosol optical depths (AOD). Results indicate that, aerosols exert a significant impact on net CO2 exchange, and their effect may be even more significant than that due to clouds. The response appears to be a general feature irrespective of the landscape and photosynthetic pathway. The CO2 sink increased with aerosol loading for forest and crop lands, and decreased for grassland. The cause for the difference in response between vegetation types is hypothesized to be canopy architecture.

AB - We present the first direct, multisite observations in Support of the hypothesis that atmospheric aerosols affect the regional terrestrial carbon cycle. The daytime growing season (summer) CO2 flux observations from six sites (forest, grasslands, and croplands) with collocated aerosol and surface radiation measurements were analyzed for high and low diffuse radiation; effect of cloud cover; and effect of high and low aerosol optical depths (AOD). Results indicate that, aerosols exert a significant impact on net CO2 exchange, and their effect may be even more significant than that due to clouds. The response appears to be a general feature irrespective of the landscape and photosynthetic pathway. The CO2 sink increased with aerosol loading for forest and crop lands, and decreased for grassland. The cause for the difference in response between vegetation types is hypothesized to be canopy architecture.

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Direct observations of the effects of aerosol loading on net ecosystem CO₂ exchanges over different landscapes

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