Classification of cloud scenes by Argus spectral data

et al. 2021

JEP

Self Cite

The existing methods for detection of the cloud scenes are applied at relatively small spectral range within shortwave upwelling radiative wavelength flux. We have reported a new method for detection of the cloud scenes based on the Radiance Enhancement (RE). This method can be used to cover a significantly wider spectral range from 1100 nm to 1700 nm by using datasets from the space-orbiting micro-spectrometer Argus 1000. Due to high sunlight reflection of the smoke originated from the forest or field fires the proposed RE method can also be implemented for detection of combustion aerosols. This approach can be a promising technique for efficient detection and continuous monitor of the seasonal forest and field fires. To the best of our knowledge this is the first report showing how a cloud method can be generalized for efficient detection of the forest fires due to combustion-originated reflectance.

Section: Introductionmentioning

confidence: 99%

Efficient Application of the Radiance Enhancement Method for Detection of the Forest Fires Due to Combustion-Originated Reflectance

Siddiqui¹,

Jagpal²,

et al. 2021

JEP

Self Cite

“…The large-scale datasets collected from space by a micro-spectrometer orbiting around the Earth can be retrieved to obtain the mixing ratios of the atmospheric gases like CO 2 , CO, H 2 O, CH 4 , O 2 , O 3 , N 2 O [1][2][3][4][5][6] and to estimate levels of particulate matter, especially hazardous PM 2.5 particles [7]. This type of large-scale remote space data are used by our research group to detect and monitor the sources of some greenhouse gases [5,6,[8][9][10]. The retrieved results of the NIR space data can be used not only to analyze and trace greenhouse gases, but also to predict their tendency and dynamics.…”

Section: Introductionmentioning

confidence: 99%

Effect of the instrument slit function on upwelling radiance from a wavelength dependent surface reflectance

Jagpal¹,

Siddiqui²,

et al. 2021

Preprint

Self Cite

The Radiance Enhancement (RE) method was introduced for efficient detection of clouds from the space. Recently we have also reported that due to high reflectance of combustion-originated smokes this approach can also be generalized for detection of the forest fires by retrieving and analyzing datasets collected from a space orbiting micro-spectrometer operating in the near infrared spectral range. In our previous publication we have performed a comparison of observed and synthetic radiance spectra by developing a method for computation of surface reflectance consisting of different canopies by weighted sum based on their areal coverage. However, this approach should be justified by a method based on corresponding proportions of the upwelling radiance. The results of computations we performed in this study reveals a good match between areal coverage of canopies and the corresponding proportions of the upwelling radiance due to effect of the instrument slit function.

“…A transmission through clouds typically is not considered due to complexities related to different effects leading to very inaccurate prediction (Clough et al, 2006;Siddiqui et al, 2015;Siddiqui et al, 2017a;Siddiqui, 2017bSu et al, 2013;Cullather et al, 1997). Therefore, the retrievals are mostly attempted on observed profiles where the presence of macroscopic clouds is visibly absent.…”

Section: Introductionmentioning

confidence: 99%

Carbon dioxide retrieval of Argus 1000 space data by using GENSPECT line-by-line radiative transfer model

Jagpal¹,

Siddiqui²,

et al. 2019

ENRR

The micro-spectrometer Argus 1000 being in space continuously monitors the sources and sinks of the trace gases. It is commonly believed that among other gases CO 2 is the major contributor causing the greenhouse effect. Argus 1000 along its orbit gathers the valuable spectral data that can be analyzed and retrieved. In this paper we present the retrieval of CO 2 gas in the near infrared window 1580 to 1620 nm by using line-by-line code GENSPECT. The retrieved Argus 1000 space data taken over British Columbia on May 31, 2010 indicates an enhancement of CO 2 by about 30%.