GRWG/GDWG IR Group Web Meeting 2025-02-13

Agenda

1) Zhong Gu(CMA): The Uncertainty of SNO Cross-Calibration for Satellite Infrared Channels. (20 minutes + 10 minutes discussion)
2) Annual meeting IR sub-group agenda and talks discussion. (20 minutes)

Attendees

Guest Chair: Chengli Qi

CMA: Chengli Qi, Gu Zhong, Yong Zhang

EUMETSAT: Tim Hewison, Vincent Debaecker, Ali Mousivand, Mounir Lekouara

JMA: Masaya Takahashi, Misaki Eiki, Shin Koyamatsu

KMA: Euidong Hwang

NASA: David Doeling

UMD: Likun Wang, Manik Bali,

ESA: Stefano Casadio

University of Hamburg : Martin Burgdorf

NOAA? T?

Summary

Chengli Qi: Do you calculate other channels (e.g., absorption channels), in addition to window channels?
A: We only compute window channels.
Chengli: The window channels are not sensitive to the spectral shape. Maybe you can try other channels.

Tim Hewison: 1) spectral uncertainties - How about IRAS spectral uncertainties? 2) What is the function of your algorithms? 3) You include the uncertainty of reference HIRAS, how do you do that?
A: 1) 10 ppm for HIRAS 2) Show the slides for method and models: weighted regression 3) so many collocations on the same platform.

Dave Doeling: How do you check the time difference MERSI and IRAS?
A: He used the simulated data instead of the real data.
Dave Doeling: How about the angle angles? Does it cause uncertainties?
Tim comments that the time difference does cause the difference. Sometimes it causes systemic bias. But the random errors will be canceled out with large samples.

Likun Wang comments that the spectral response function does matters at window channels for inter-calibration purpose.

Outcome

Action: ??