Search found 11 matches

by ses2271
Wed Jun 21, 2023 4:06 pm America/New_York
Forum: Questions/Comments
Question: CALIPSO isolated 80 km layer filter
Replies: 2

CALIPSO isolated 80 km layer filter

Hi there, I have some questions about applying the Isolated 80 km layer filter to the L2 data. My understanding from Tackett et al., 2018 https://amt.copernicus.org/articles/11/4129/2018/amt-11-4129-2018.pdf is that the L3 data product is derived from the L2 profile product, which in turn is derived...
by ses2271
Wed Dec 21, 2022 6:21 pm America/New_York
Forum: Questions/Comments
Question: CALIPSO UTC and Profile time in L2 data
Replies: 2

CALIPSO UTC and Profile time in L2 data

Hello there, I'm trying to collocate CALIPSO retrievals with those from another instrument. I've downloaded the L2 dataset that I need (CAL_LID_L2_05kmAPro-Standard-V4-20), but when I look at the two time variables available ("Profile_UTC_Time" and "Profile_Time") these are in fo...
by ses2271
Sat Nov 26, 2022 9:46 pm America/New_York
Forum: Questions/Comments
Question: Zenith Angle and MODIS AODs
Replies: 1

Re: Zenith Angle and MODIS AODs

I think I have an answer to my own question. It seems that the optical depth is determined by the projecting of the observed extinction onto the vertical. That is, measured_extinction*cos(zenith_angle) would be what MODIS retrievals are showing. Is this correct?

Best,
Sarah
by ses2271
Mon Nov 21, 2022 9:47 pm America/New_York
Forum: Questions/Comments
Question: Zenith Angle and MODIS AODs
Replies: 1

Zenith Angle and MODIS AODs

Hi there, I'm comparing the seasonality of different satellite and ground-based AOD products in the high-ish (60N and above) latitudes, and find substantial differences between data products generated from LiDAR versus passive sensors. I'm wondering whether the AODs calculated from MODIS (Deep Blue ...
by ses2271
Sat Jul 03, 2021 10:19 am America/New_York
Forum: Questions/Comments
Question: CALIOP polluted continental/elevated smoke and height
Replies: 3

Re: CALIOP polluted continental/elevated smoke and height

Hi there,

I answered my own question by realizing that it is only the top of the layer has to be above the 2.5 km threshold for the SCA to classify the entire layer as elevated smoke, which is why there is elevated smoke below 2.5 km. Thank you for your help!

Best,

Sarah
by ses2271
Tue Jun 29, 2021 4:40 pm America/New_York
Forum: Questions/Comments
Question: CALIOP polluted continental/elevated smoke and height
Replies: 3

CALIOP polluted continental/elevated smoke and height

Hello again, I have a question regarding some of my observations using the L3 CALIOP tropospheric profile all-sky dataset, V4.20/21. In reading about the V4 scene classification algorithm (https://amt.copernicus.org/articles/11/6107/2018/amt-11-6107-2018.pdf) it seems like it should be impossible fo...
by ses2271
Tue Jun 29, 2021 4:22 pm America/New_York
Forum: Questions/Comments
Question: L3 CALIPSO AOD Mean Values vs AOD by aerosol type
Replies: 3

Re: L3 CALIPSO AOD Mean Values vs AOD by aerosol type

Hi David,

Yes, this is very helpful--thank you!
by ses2271
Tue Jun 15, 2021 6:47 pm America/New_York
Forum: Questions/Comments
Question: L3 CALIPSO AOD Mean Values vs AOD by aerosol type
Replies: 3

L3 CALIPSO AOD Mean Values vs AOD by aerosol type

Hi there, On the level 3 tropospheric aerosol profile data users page (https://www-calipso.larc.nasa.gov/resources/calipso_users_guide/data_summaries/l3/cal_lid_l3_tropospheric_apro_v4-20_desc.php) it indicates that the data product contains the variable AOD_Mean [Dust, Elevated Smoke, Polluted Dust...
by ses2271
Mon Jun 14, 2021 12:36 am America/New_York
Forum: Questions/Comments
Question: Where to get CALIPSO L3 Aerosol Products after 7/2020
Replies: 5

Re: Where to get CALIPSO L3 Aerosol Products after 7/2020

Hi Cheyenne,

Thank you so much for letting me know!


Best,
Sarah
by ses2271
Fri May 21, 2021 1:27 pm America/New_York
Forum: Questions/Comments
Question: Where to get CALIPSO L3 Aerosol Products after 7/2020
Replies: 5

Re: Where to get CALIPSO L3 Aerosol Products after 7/2020

Hi Cheyenne,

Thanks so much for the quick response! Since V4-21 is not yet available, any chance you know whether I can access V4-20 for the last half of 2020?

Many thanks,
Sarah