# Presentation: 894260

## Shipboard measurements for  AIRS validation

**Peter J.  Minnett **
**Rosenstiel School of Marine and Atmospheric Science,**
**University of Miami, Florida, USA**

**AIRS Science Team Meeting**
**Camp Springs**
**25 ******** 27 February 2003**

## Overview

- Ship board measurements for AIRS:
- M-AERI
- Radiosondes (Vaisala RS90, some RS80)
- μwave radiometer (Radiometrics WVR1100, 23.8 & 31.4 GHz)
- All-sky cameras (cloud amounts)
- PRPs for aerosol optical thickness
- Joint project with U. Wisconsin-Madison

## M-AERI data for AIRS SST validation

- Skin SST is source of signal detected by infrared satellite radiometers.
- Use of M-AERI for validation is comparing “like with like.”
- For example, satellite SST accuracy determined with buoy data includes near surface SST variability, which can be significant during the day.

## M-AERI spectra

- From Minnett, P. J., R. O. Knuteson, F. A. Best, B. J. Osborne, J. A. Hanafin and O. B. Brown (2001). "The Marine-Atmospheric Emitted Radiance Interferometer  (M-AERI), a high-accuracy, sea-going infrared spectroradiometer." Journal of Atmospheric and Oceanic Technology. 18(6): 994-1013.

- Air Temperature

- Skin SST

- Both temperatures measured by one instrument, one calibration.

## The M-AERI 

## M-AERI calibration targets

## Marine-Atmospheric Emitted Radiance Interferometer (M-AERI)

## Temperatures are traced to NIST

- On-board black-body cavities have thermometers calibrated to NIST-traceable thermometers (SSEC)
- Periodic calibration using a 3rd black body in M-AERI zenith view.
- Periodic calibration of M-AERI system with a NIST-designed Water-Bath Black-Body target at RSMAS, using NIST-traceable reference thermometers.
- RSMAS Water-Bath Black-Body target characterized with NIST EOS TXR

- NIST EOS TXR

- TXR characterizing the RSMAS WBBB

## M-AERI at sea 

## M-AERI in the Arctic

## M-AERI in the Mediterranean

- One of a series of cruises in collaboration with CNR Institute of Atmospheric Physics and Climate, Rome.

## M-AERI  on USCGC Polar Sea 

- M-AERI was embarked on the USCGC *Polar Sea* in Seattle in early November for cross Pacific Transect......

## Polar Sea Storm

## Post-cruise M-AERI

## Time-series of M-AERI measurements on Explorer of the Seas

- The *Explorer of the Seas* is a Royal Caribbean Cruise Liner, operating a bi-weekly schedule out of Miami. It is outfitted as an oceanographic and atmospheric research vessel, very suitable for satellite validation. For more details see http://www.rsmas.miami.edu/rccl/

## Slide 17

## Slide 18

## M-AERI data from Explorer of the Seas

## Ancillary sensors

## Inventory of validation data (September 1, 2002 to January 31 2003)

- 11,117 M-AERI SST retrievals (7463 Explorer; 1026 Urania; 2628 Pierre Radisson)
- > 25,000 M-AERI atmospheric spectra, 3-18μm, 0o & 55o zenith angle
- 95 days of microwave precipitable water measurements (70 Explorer,  25 Polar Sea.)
- 95 days of microwave cloud water content (ditto)
- 114 radiosonde profiles (80 Explorer; 11 Polar Sea; 23 Pierre Radisson)
- 197 days of all sky camera data (153 Explorer; 18 Urania; 26 Radisson)
- 153 days of PRP

## Future plans

- Validate AIRS SSTs with M-AERI (and buoys)
- 2003 cruises:
*Explorer of the Seas* –Caribbean circuits
*Polar Sea* – Melbourne – Yokohama – Seattle
*Urania*: Mediterranean, March-May
*Franklin*: Canadian Arctic, September 2003, for 12 months (?)
*Healy* – N. American Waters (?)
*Tangaroa*: November, NZ SOLAS (?)
*Polar Star*: Seattle – Sydney, November -December
- Compare M-AERI and AIRS atmospheric profile retrievals, and spectra.
- Compare AVHRR, MODIS, AIRS, AMSR SSTs
- GHRSST-PP is interested in AIRS SSTs, especially in very clear micro-windows.

## pminnett@rsmas.miami.edu