Early detection of drought onset using near surface temperature and humidity observed from space

Behrangi, Ali; Fetzer, Eric J.; Granger, Stephanie

doi:10.1080/01431161.2016.1204478

Cited by 36 publications

(31 citation statements)

References 31 publications

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“…Given that over the residual areas, shown in Figure 3b, continental evapotranspiration provides the main moisture source for precipitation, vapor pressure deficit (VPD) feedback could be a likely candidate as high VPD can inhibit precipitation formation (Behrangi et al, 2016;Seager et al, 2015). This indicates that either climate models underestimate the response to the forcing at local scale or other external drivers and/or local feedbacks are at work.…”

Section: Discussionmentioning

confidence: 99%

“…This indicates that either climate models underestimate the response to the forcing at local scale or other external drivers and/or local feedbacks are at work. Given that over the residual areas, shown in Figure 3b, continental evapotranspiration provides the main moisture source for precipitation, vapor pressure deficit (VPD) feedback could be a likely candidate as high VPD can inhibit precipitation formation (Behrangi et al, 2016;Seager et al, 2015). The recently observed positive trend in incoming solar radiation reaching the surface of northern SA in the dry season could partly be attributed to cloud reduction due to radiatively absorbing aerosols such as black carbon (Barkhordarian et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

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Simultaneous Regional Detection of Land‐Use Changes and Elevated GHG Levels: The Case of Spring Precipitation in Tropical South America

Barkhordarian

Storch²,

Behrangi

et al. 2018

Geophysical Research Letters

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A decline in dry season precipitation over tropical South America has a large impact on ecosystem health of the region. Results here indicate that the magnitude of negative trends in dry season precipitation in the past decades exceeds the estimated range of trends due to natural variability of the climate system defined in both the preindustrial climate and during the 850–1850 millennium. The observed drying is associated with an increase in vapor pressure deficit. The univariate detection analysis shows that greenhouse gas (GHG) forcing has a systematic influence in negative 30‐year trends of precipitation ending in 1998 and later on. The bivariate attribution analysis demonstrates that forcing by elevated GHG levels and land‐use change are attributed as key causes for the observed drying during 1983–2012 over the southern Amazonia and central Brazil. We further show that the effect of GS signal (GHG and sulfate aerosols) based on RCP4.5 scenario already has a detectable influence in the observed drying. Thus, we suggest that the recently observed “drier dry season” is a feature which will continue and intensify in the course of unfolding anthropogenic climate change. Such change could have profound societal and ecosystem impacts over the region.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Simultaneous Regional Detection of Land‐Use Changes and Elevated GHG Levels: The Case of Spring Precipitation in Tropical South America

Barkhordarian

Storch²,

Behrangi

et al. 2018

Geophysical Research Letters

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“…Several studies have used AIRS for weather forecasting and global climate research (Ishimoto et al 2016. By calculating vapor pressure deficit (VPD) using T and RH from AIRS, Behrangi et al (2016) showed that AIRS can also provide valuable information for drought early detection. In this study, we use AIRS VPD, T, and RH obtained from Jet Propulsion Laboratory (JPL) AIRS project servers.…”

Section: Airsmentioning

confidence: 99%

“…An alternative approach is to investigate VPD that can be calculated directly from T and RH observed by AIRS. It has been shown that VPD can provide useful information for early detection of drought (Behrangi et al 2015(Behrangi et al , 2016. Therefore, it is important to investigate at what lead time AIRS observations of VPD over Iraq can provide the highest correlation with dust event incidence over SWI.…”

Section: Drought Analysismentioning

confidence: 99%

Impact of drought on dust storms: case study over Southwest Iran

Javadian

Behrangi

Sorooshian

2019

Environ. Res. Lett.

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Dust storms are common meteorological events in arid and semi-arid regions, particularly in Southwest Iran (SWI). Here we study the relation between drought events in Iraq and dust storms in SWI between 2003 and 2018. The HYSPLIT model showed that central and southern Iraq are the main dust sources for SWI. Mean annual aerosol optical depth (AOD) analysis demonstrated that 2008 and 2009 were the dustiest years since 2003 and there is an increased frequency of summertime extreme dust events in the years 2008 and 2009. The Standardized Precipitation Evapotranspiration Index revealed that drought in Iraq significantly affects dust storms in Iran. Similarly, dramatic desiccation of Iraq wetlands has contributed to increasing fall dust events in SWI. AOD in SWI is highly correlated (−0.76) with previous-month vapor pressure deficit (VPD) over Iraq, demonstrating the potential of VPD for dust event forecasting.

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“…The data are regularly used in studies of processes affecting weather [7] and climate as well as the validation of weather and climate models [8]. The data are also used in applications including volcano alerts [9], drought prediction [10], and air quality and pollution transport [11]. The AIRS instrument has shown exceptional radiometric stability to date, making it a valuable tool for climate trending and model validation [12].…”

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confidence: 99%

SI-Traceability and Measurement Uncertainty of the Atmospheric Infrared Sounder Version 5 Level 1B Radiances

et al. 2020

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The Atmospheric Infrared Sounder (AIRS) on the EOS Aqua Spacecraft was launched on 4 May 2002. The AIRS is designed to measure atmospheric temperature and water vapor profiles and has demonstrated exceptional radiometric and spectral accuracy and stability in orbit. The International System of Units (SI)-traceability of the derived radiances is achieved by transferring the calibration from the Large Area Blackbody (LABB) with SI traceable temperature sensors, to the On-Board Calibrator (OBC) blackbody during preflight testing. The AIRS views the OBC blackbody and four full aperture space views every scan. A recent analysis of pre-flight and on-board data has improved our understanding of the measurement uncertainty of the Version 5 AIRS L1B radiance product. For temperatures greater than 260 K, the measurement uncertainty is better than 250 mK 1-sigma for most channels. SI-traceability and quantification of the radiometric measurement uncertainty is critical to reducing biases in reanalysis products and radiative transfer models (RTMs) that use AIRS data, as well as establishing the suitability of AIRS as a benchmark for radiances established in the early 2000s.Remote Sens. 2020, 12, 1338 2 of 25 measure surface temperature and emissivity, cloud top height, cloud liquid water and cloud fraction. The data from the IR sounders assimilated into Numerical Weather Prediction (NWP) models have demonstrated amongst the highest forecast improvement in NWP models of all data types. The data are regularly used in studies of processes affecting weather [7] and climate as well as the validation of weather and climate models [8]. The data are also used in applications including volcano alerts [9], drought prediction [10], and air quality and pollution transport [11]. The AIRS instrument has shown exceptional radiometric stability to date, making it a valuable tool for climate trending and model validation [12]. Remote Sens. 2019, 11, x FOR PEER REVIEW 2 of 25 models have demonstrated amongst the highest forecast improvement in NWP models of all data types. The data are regularly used in studies of processes affecting weather [7] and climate as well as the validation of weather and climate models [8]. The data are also used in applications including volcano alerts [9], drought prediction [10], and air quality and pollution transport [11]. The AIRS instrument has shown exceptional radiometric stability to date, making it a valuable tool for climate trending and model validation [12]. Remote Sens. 2020, 12, 1338 3 of 25The AIRS is a reference sensor in the Global Space-Based Intercalibration of Sensors (GSICS) [17,18]. AIRS is used operationally by the Japan Meteorological Agency (JMA) for comparison to Himawari 8/9 AHI JM [19], the Korean Meteorological Administration (KMA) for comparison to COMS [20], and NOAA for comparison to CrIS [21] and GOES [22], and EUMETSAT for comparison to IASI [23]. The results show that the AIRS compares with IASI and CrIS to better than 0.2 K (1-sigma) in most cases. The long record of AIRS, com...

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Early detection of drought onset using near surface temperature and humidity observed from space

Cited by 36 publications

References 31 publications

Simultaneous Regional Detection of Land‐Use Changes and Elevated GHG Levels: The Case of Spring Precipitation in Tropical South America

Simultaneous Regional Detection of Land‐Use Changes and Elevated GHG Levels: The Case of Spring Precipitation in Tropical South America

Impact of drought on dust storms: case study over Southwest Iran

SI-Traceability and Measurement Uncertainty of the Atmospheric Infrared Sounder Version 5 Level 1B Radiances

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