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Hiren Jethva
Aerosol remote sensing scientist at USRA/NASA Goddard Tweets are my own, RT aren't endorsements
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Hiren Jethva Sep 3
Entire hurricane is captured by both AI products (354-388, 340-380) of . Most likely it's an artifact caused by the LER model, which doesn't account for the angular effects of cloud scattering/phase function, assumed to calculate AI.
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Hiren Jethva Aug 28
Replying to @SanGasso
It reminds me of a figure of my 2011 ACP paper showing distribution of OMI AI for Sep 2007
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Hiren Jethva Jul 18
One may expect congestion of fire activities due to delayed plantation and shorter time window for switching to wheat, but totality of fire season seems to hard to predict at this point
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Hiren Jethva Jul 18
Crop amounts will reflect its signature in satellite based vegetation index (VI) data, according to an empirical relation. So VI data towards end of September when crops are in matured stage will help us to estimate the intensity of fire season
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Hiren Jethva Jul 18
Replying to @parthaabosu @Telegraph
I happened to the review this paper. A good article showing the aggregation of crop fires due to delay in rice plantation and harvesting, but missed to highlight the effect of crop amounts hence residue on rising level of fires.
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Hiren Jethva Jul 14
Probably a result of semi-direct effect leading to increased stability of atmospheric layers where dust (absorption) resides inhibiting cloud-top entrainment thereby preserving clouds at lower levels.
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Hiren Jethva Jul 12
Replying to @dhimansaurabh
Saurabh, the high-levels of PM in New Delhi appear to be a result of dust transport from the Thar Desert, bringing finer and coarser mode mineral dust measured in PM data. Attached images are from VIIRS (RGB) and OMPS (UV Aerosol Index) from S-NPP satellite.
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Hiren Jethva Jul 4
A classic demonstration of OMACA above-cloud aerosol optical depth product capturing wildfire smoke transport above cloud over eastern Pacific
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Hiren Jethva Jun 2
From Alberta, Canada to Europe: Wildfire smoke on a long intercontinental flight. An impressive east-west extent of smoke. Significant transport above clouds. Too early for such events which normally occur in July-Aug
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Hiren Jethva May 16
Today's (05/16) true-color animation of dust circulating extratropical low-pressure system
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Hiren Jethva retweeted
Santiago Gassó May 16
More brown cloud effect in N Asia today, high AI from . Note the high values are because dust (red circle) and smoke (green), both are absorbing aerosol and the AI cannot differentiate between the two
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Hiren Jethva May 15
The story continues: strong winds fueled by the low-pressure system has picked up a swath of dust over the Inner Mongolian desert. Interesting event! what happens next? dust mixing with clouds or long-range transport?
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Hiren Jethva May 15
Here goes the above-cloud AOD from OMACA product
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Hiren Jethva May 15
Updated chart of agr. fire occurrence over Punjab-Haryana, it appears that the peak of fire activities occurred on May 13th, declining rapidly since then partly due to cloud cover restricting fire detection
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Hiren Jethva May 15
A daytime overpass on May 13 captured detailed vertical structure of above-cloud dust locked in low-pressure cyclonic circulation
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Hiren Jethva May 14
Thanks, Scott for bringing your insight and expertise in this case!
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Hiren Jethva May 13
wheat crop fires are on a rising curve, steadily increased from 3-May, unsure whether the peak has reached.
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Hiren Jethva May 13
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Hiren Jethva May 12
Wheat residue burning occurrence over northwestern India so far (Apr 1-May 12) is comparable to that of 2017 and 2018. Overall, MODIS data shows a marginal negative trend during Aqua (2003-2019). Some of inter-annual variations could be due to clouds hindering fire detection
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Hiren Jethva May 12
It's real, RGB was made from MODIS 1-km L1B data (MYD021KM) with min/max val of R, G, B adjusted for the entire image to enhance the dust feature.
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