A Multisensor satellite‐based assessment of biomass burning aerosol radiative impact over Amazonia

Patadia, Falguni; Gupta, Pawan; Christopher, Sundar A.; Reid, Jeffrey S.

doi:10.1029/2007jd009486

Cited by 26 publications

(50 citation statements)

References 52 publications

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“…During the past decades, a series of studies on aerosol optical properties and associated direct radiative effects continue to emerge over Amazonia [3,17], Southeast Asia [18,19], Northeast India [11,20,[23][24][25][26][27][28][29], Central India [12], and global land [2,[30][31][32][33] and ocean [4,5,21]. The results showed that the averaged ADRE at TOA was negative at global scale [4][5][6], but it varied regionally probably due to the comprehensive effects of aerosol optical properties and underlying surface characteristics.…”

Section: Introductionmentioning

confidence: 81%

“…In contrast, the large aerosol loadings (AOD550 > 0.6) over YRD do not (Table 2) are all negative, there are still few positive IADRE values ( Figure 12) over 1 • × 1 • grid cells, probably due to the comprehensive effect of aerosol optical properties and surface reflectivity. Generally, positive IADRE tends to be observed over regions with strong absorbing aerosols and high surface reflectivity [2,3]. Assuming that the aerosol optical properties remain constant over bright surfaces, the aerosol layer appears "darker" than its background.…”

Section: Frequency Distribution Of Temporal Variationmentioning

confidence: 99%

“…Since Fclr is estimated from the linear regression between CERES upward SW flux and concurrent MODIS AOD 550 , the systematic bias in MODIS AOD retrieval (i.e., the data on the "x-axis") will lead to a systematic uncertainty of the intercept (Fclr). According to previous studies [3,5,18], the systematic MODIS AOD bias is about ±0.05. Besides, the 15-year mean IADRE efficiency (the median value of slope for the regression) is estimated to be 65.18 Wm −2 τ −1 .…”

Section: Uncertainty Analysismentioning

confidence: 99%

“…Obviously, it is a challenge due to diverse systematic uncertainties in calibration of CERES radiances (±0.4 Wm −2 ), unfiltering of CERES radiances at TOA (±0.4 Wm −2 ), conversion of CERES TOA radiances to fluxes by ADMs (±0.4 Wm −2 ), cloud contamination (±0.5 Wm −2 ) and estimation of SW fluxes at TOA without aerosols in clear sky (i.e., Fclr) [2,3,18,45]. Among them, the calculation of Fclr is the largest error source for uncertainty.…”

Section: Uncertainty Analysismentioning

confidence: 99%

“…It can directly absorb and scatter solar radiation at the top-of-atmosphere (TOA) and surface, which is defined as Aerosol Direct Radiative Effect (ADRE). The ADRE can be quantitatively calculated through the difference of upward shortwave (SW) solar fluxes without (Fclr) and with (Faero) aerosols for clear skies [2,3]. The aerosol optical properties such as the aerosol optical depth (AOD) and the Ångström exponent (AE) are key parameters for estimating ADRE on the earth-atmosphere system [4].…”

Section: Introductionmentioning

confidence: 99%

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Aerosol Optical Properties and Associated Direct Radiative Forcing over the Yangtze River Basin during 2001–2015

Wang

Lin

et al. 2017

Remote Sensing

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Abstract:The spatiotemporal variation of aerosol optical depth at 550 nm (AOD 550 ), Ångström exponent at 470-660 nm (AE ), water vapor content (WVC), and shortwave (SW) instantaneous aerosol direct radiative effects (IADRE) at the top-of-atmosphere (TOA) in clear skies obtained from the Moderate Resolution Imaging Spectroradiometer (MODIS) and Clouds and the Earth's Radiant Energy System (CERES) are quantitatively analyzed over the Yangtze River Basin (YRB) in China during [2001][2002][2003][2004][2005][2006][2007][2008][2009][2010][2011][2012][2013][2014][2015]. The annual and seasonal frequency distributions of AE and AOD 550 reveal the dominance of fine aerosol particles over YRB. The regional average AOD 550 is 0.49 ± 0.31, with high value in spring (0.58 ± 0.35) and low value in winter (0.42 ± 0.29). The higher AOD 550 (≥0.6) is observed in midstream and downstream regions of YRB and Sichuan Basin due to local anthropogenic emissions and long-distance transport of dust particles, while lower AOD 550 (≤0.3) is in high mountains of upstream regions. The IADRE is estimated using a linear relationship between SW upward flux and coincident AOD 550 from CERES and MODIS at the satellite passing time. The regional average IADRE is −35.60 ± 6.71 Wm −2 , with high value (−40.71 ± 6.86 Wm −2 ) in summer and low value (−29.19 ± 7.04 Wm −2 ) in winter, suggesting a significant cooling effect at TOA. The IADRE at TOA is lower over Yangtze River Delta (YRD) (≤−30 Wm −2 ) and higher in midstream region of YRB, Sichuan Basin and the source area of YRB (≥−45 Wm −2 ). The correlation coefficient between the 15-year monthly IADRE and AOD 550 values is 0.63, which confirms the consistent spatiotemporal variation patterns over most of the YRB. However, a good agreement between IADRE and AOD is not observed in YRD and the source area of YRB, which is probably due to the combined effects of aerosol and surface properties.

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Section: Introductionmentioning

confidence: 81%

Section: Frequency Distribution Of Temporal Variationmentioning

confidence: 99%

Section: Uncertainty Analysismentioning

confidence: 99%

Section: Uncertainty Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Aerosol Optical Properties and Associated Direct Radiative Forcing over the Yangtze River Basin during 2001–2015

Wang

Lin

et al. 2017

Remote Sensing

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Measurement‐based estimates of direct radiative effects of absorbing aerosols above clouds

Feng

Christopher

2015

JGR Atmospheres

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The elevated layers of absorbing smoke aerosols from western African (e.g., Gabon and Congo) biomass burning activities have been frequently observed above low-level stratocumulus clouds off the African coast, which presents an excellent natural laboratory for studying the effects of aerosols above clouds (AAC) on regional energy balance in tropical and subtropical environments. Using spatially and temporally collocated Moderate Resolution Imaging Spectroradiometer, Ozone Monitoring Instrument (OMI), and Clouds and the Earth's Radiant Energy System data sets, the top-of-atmosphere shortwave aerosol direct shortwave radiative effects (ARE) of absorbing aerosols above low-level water clouds in the southeast Atlantic Ocean was examined in this study. The regional averaged instantaneous ARE has been estimated to be 36.7 ± 20.5 Wm À2 (regional mean ± standard deviation) along with a mean positive OMI Aerosol Index at 1.3 in August 2006 based on multisensors measurements. The highest magnitude of instantaneous ARE can even reach 138.2 Wm À2 . We assess that the 660 nm cloud optical depth (COD) values of 8-12 is the critical value above (below) which aerosol absorption (scattering) effect dominates and further produces positive (negative) ARE values. The results further show that ARE values are more sensitive to aerosols above lower COD values than cases for higher COD values. This is among the first studies to provide quantitative estimates of shortwave ARE due to AAC events from an observational perspective.

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Satellite observations of terrestrial water storage provide early warning information about drought and fire season severity in the Amazon

et al. 2013

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[1] Fire risk in the Amazon can be predicted several months before the onset of the dry season using sea surface temperatures in the tropical north Atlantic and tropical Pacific. The lead times between ocean state and the period of maximum burning (4-11 months) may enable the development of forecasts with benefits for forest conservation, yet the underlying physical and biological mechanisms responsible for these temporal offsets are not well known. Here, we examined the hypothesis that year-to-year variations in soil water recharge during the wet season modify atmospheric water vapor and fire behavior during the following dry season. We tested this hypothesis by analyzing terrestrial water storage observations from the Gravity Recovery and Climate Experiment (GRACE), active fires from the Moderate Resolution Imaging Spectroradiometer (MODIS), and several other satellite and atmospheric reanalysis datasets during 2002-2011. We found that terrestrial water storage deficits preceded severe fire seasons across the southern Amazon. The most significant relationships between monthly terrestrial water storage and the sum of active fires during the dry season occurred during April-August (p < 0.02), corresponding to 1-5 month lead times before the peak month of burning (September). Analysis of other datasets provided evidence for a cascade of processes during drought events, with lower cumulative precipitation (and higher cumulative evapotranspiration) in the wet season substantially reducing terrestrial water storage, and subsequently, surface and column atmospheric water vapor. Our results suggest that terrestrial water storage observations from GRACE have the potential to improve fire season forecasts for the southern Amazon.Citation: Chen, Y., I. Velicogna, J. S. Famiglietti, and J. T. Randerson (2013), Satellite observations of terrestrial water storage provide early warning information about drought and fire season severity in the Amazon, J. Geophys. Res.

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A Multisensor satellite‐based assessment of biomass burning aerosol radiative impact over Amazonia

Cited by 26 publications

References 52 publications

Aerosol Optical Properties and Associated Direct Radiative Forcing over the Yangtze River Basin during 2001–2015

Aerosol Optical Properties and Associated Direct Radiative Forcing over the Yangtze River Basin during 2001–2015

Measurement‐based estimates of direct radiative effects of absorbing aerosols above clouds

Satellite observations of terrestrial water storage provide early warning information about drought and fire season severity in the Amazon

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