A24B-01 INVITED 16:00h

The High Resolution Dynamics Limb Sounder (HIRDLS) Instrument on AURA

* Gille, J (gille@ucar.edu) , University of Colorado, 3085 Center Green Dr., Boulder, CO 80301
* Gille, J (gille@ucar.edu) , NCAR, PO Box 3000, Boulder, CO 80307
Barnett, J (j.barnett@physics.ox.ac.uk) , University of Oxford, Parks Road, Oxford, OX1 3PU United Kingdom
Apollo, P (peter.h.apollo@lmco.com) , Lockheed Martin Space Systems Company - Advanced Technology Center, 3251 Hanover St., Palo Alto, CA 94304
Barker, M (marion.barker@lmco.com) , Lockheed Martin Space Systems Company - Advanced Technology Center, 3251 Hanover St., Palo Alto, CA 94304
Coffey, M (coffey@ucar.edu) , NCAR, PO Box 3000, Boulder, CO 80307
Craft, J (jcraft@ucar.edu) , University of Colorado, 3085 Center Green Dr., Boulder, CO 80301
Dials, M (dials@ucar.edu) , University of Colorado, 3085 Center Green Dr., Boulder, CO 80301
Eden, T (teden@ucar.edu) , NCAR, PO Box 3000, Boulder, CO 80307
Hepplewhite, C (c.hepplewhite@physics.ox.ac.uk) , University of Oxford, Parks Road, Oxford, OX1 3PU United Kingdom
Koepp-Baker, N (nicholas.b.koepp-baker@lmco.com) , Lockheed Martin Space Systems Company - Advanced Technology Center, 3251 Hanover St., Palo Alto, CA 94304
Lambert, A (alambert@ucar.edu) , NCAR, PO Box 3000, Boulder, CO 80307
Lee, A (alee@ucar.edu) , University of Colorado, 3085 Center Green Dr., Boulder, CO 80301
Loh, J (loh@ucar.edu) , University of Colorado, 3085 Center Green Dr., Boulder, CO 80301
Mankin, W (mankin@ucar.edu) , NCAR, PO Box 3000, Boulder, CO 80307
Nardi, B (nardi@ucar.edu) , NCAR, PO Box 3000, Boulder, CO 80307
Rudolf, W (wayne.p.rudolf@lmco.com) , Lockheed Martin Space Systems Company - Advanced Technology Center, 3251 Hanover St., Palo Alto, CA 94304
Dean, V (vdean@ucar.edu) , University of Colorado, 3085 Center Green Dr., Boulder, CO 80301
Stone, K (kstone@ucar.edu) , University of Colorado, 3085 Center Green Dr., Boulder, CO 80301
Talipsky, R (ray.talipsky) , Lockheed Martin Space Systems Company - Advanced Technology Center, 3251 Hanover St., Palo Alto, CA 94304
Whitney, J (john.whitney@tiscali.co.uk) , University of Oxford, Parks Road, Oxford, OX1 3PU United Kingdom
Wilda, C (claire.l.wilda@lmco.com) , Lockheed Martin Space Systems Company - Advanced Technology Center, 3251 Hanover St., Palo Alto, CA 94304
Williams, A (willia@ucar.edu) , University of Colorado, 3085 Center Green Dr., Boulder, CO 80301
Woodard, D (woodard@ucar.edu) , University of Colorado, 3085 Center Green Dr., Boulder, CO 80301

HIRDLS is a 21-channel limb-scanning infrared radiometer launched on the Aura satellite on 15 July, 2004. It's purpose is to measure radiances from which the vertical distributions of temperature, ozone, water vapor, and 8 other gases of chemical, radiative, or dynamical importance can be retrieved, as well as aerosol distributions. HIRDLS has been designed to obtain data with higher horizontal and vertical resolution than previously available. HIRDLS activation took place over 25 days, culminating in the detector cool-down. Unfortunately, HIRDLS experienced difficulties in seeing the atmosphere. Depending on experiment status, this talk will present and describe atmospheric data, or discuss the investigation into the anomaly. In that case we will describe the symptoms, which included observed radiances that appeared too large over most of the field of view, and increased damping of the scanner motion. The latter condition has required initial investigations with the scanner not moving. Several lines of inquiry are in motion, which we feel will resolve the likely causes of the observations, and point to remedial actions. Available data will be presented, and an outlook given for the future.

A24B-02 INVITED 16:20h

Ozone Monitoring Instrument (OMI): First results

* Levelt, P F (levelt@knmi.nl) , KNMI (Royal Netherlands Meteorological Institute), P.O. Box 201, De Bilt, NL-3730 AE Netherlands
Hilsenrath, E (ernest.hilsenrath@nasa.gov) , NASA Goddard Space Flight Center, Atmospheric Chemistry and Dynamics Branch, Code 916, Greenbelt, MD 20771 United States
Leppelmeier, G W (gilbert.leppelmeier@fmi.fi) , Finnish Meteorological Institute (FMI), Box 503, Helsinki, 00101 Finland
van den Oord, G H (bert.van.den.oord@knmi.nl) , KNMI (Royal Netherlands Meteorological Institute), P.O. Box 201, De Bilt, NL-3730 AE Netherlands
Bhartia, P K (Pawan.Bhartia@nasa.gov) , NASA Goddard Space Flight Center, Atmospheric Chemistry and Dynamics Branch, Code 916, Greenbelt, MD 20771 United States
Malkki, A (anssi.malkki@fmi.fi) , Finnish Meteorological Institute (FMI), Box 503, Helsinki, 00101 Finland

The Ozone Monitoring Instrument (OMI) is an UV/VIS nadir solar backscatter imaging spectrograph, which provides nearly global coverage in one day with a spatial resolution of $13\;x\;24$ km$^2$. OMI measures solar irradiance and Earth radiances in the wavelength range of $270$ to $500$ nm with a spectral resolution of about $0.5$ nm. OMI is a new instrument, with a heritage from the European satellite instruments GOME, GOMOS and SCIAMACHY and was contributed to the Aura mission by The Netherlands and Finland. OMI's unique capabilities for measuring important trace gases with a small footprint and daily global coverage will make a major contribution to our understanding of the expected recovery of the ozone layer, the sources and transport of aerosols and trace gases that effect global air quality and the roles of tropospheric ozone and aerosols in climate change. The talk will give an overview of the performance of the instrument, first trace gas retrievals and their early validation results. Comparisons with results obtained from EP-TOMS and SCIAMACHY will be shown.

http://www.knmi.nl/omi

A24B-03 16:40h

First Look at the Upper Tropospheric Ozone Mixing Ratio From OMI Estimated Using the Cloud Slicing Technique

* Bhartia, P K (pawan.bhartia@nasa.gov) , NASA Goddard Space Flight Center, Mail Code 916, Greenbelt, MD 20771 United States
Ziemke, J (ziemke@code916.gsfc.nasa.gov) , Joint Center for Earth Systems Technology, U. of Maryland BaltimoreCounty, Catonsville, Baltimore, MD 21228
Chandra, S (chandra@code916.gsfc.nasa.gov) , Joint Center for Earth Systems Technology, U. of Maryland BaltimoreCounty, Catonsville, Baltimore, MD 21228
Joiner, J (joanna.joiner-1@nasa.gov) , NASA Goddard Space Flight Center, Mail Code 916, Greenbelt, MD 20771 United States
Vasilkov, A (alexander_vassilkov@ssaihq.com) , Science Systems & Applications, Inc., 10210 Greenbelt Rod., Ste 400, Lanham, MD 20706
Taylor, S (steven_taylor@ssaihq.com) , Science Systems & Applications, Inc., 10210 Greenbelt Rod., Ste 400, Lanham, MD 20706
Yang, K (kyang@ltpmail.gsfc.nasa.gov) , Science Systems & Applications, Inc., 10210 Greenbelt Rod., Ste 400, Lanham, MD 20706
Ahn, C (ahn@code916.gsfc.nasa.gov) , Science Systems & Applications, Inc., 10210 Greenbelt Rod., Ste 400, Lanham, MD 20706

The Cloud Slicing technique has emerged as a powerful tool for the study of ozone in the upper troposphere. In this technique one looks at the variation with cloud height of the above-cloud column ozone derived from the backscattered ultraviolet instruments, such as TOMS, to determine the ozone mixing ratio. For this technique to work properly one needs an instrument with relatively good horizontal resolution with very good signal to noise in measuring above-cloud column ozone. In addition, one needs the (radiatively) effective cloud pressure rather than the cloud-top pressure, for the ultraviolet photons received by a satellite instrument are scattered from inside the cloud rather than from the top. For this study we use data from the OMI sensor, which was recently launched on the EOS Aura satellite. OMI is a UV-Visible backscattering instrument with a nadir pixel size of 13 x 24 km. The effective cloud pressure is derived from a new algorithm based on Rotational Raman Scattering and O$_{2}$-O$_{2}$ absorption in the 340-400 nm band of OMI.

A24B-04 17:00h

BrO, OClO and HCHO Observations from the EOS-Aura Ozone Monitoring Instrument

* Kurosu, T P (tkurosu@cfa.harvard.edu) , Harvard-Smithsonian Center for Astrophysics, 60 Garden Street (MS 50), Cambridge, MA 02138 United States
Chance, K (kchance@cfa.harvard.edu) , Harvard-Smithsonian Center for Astrophysics, 60 Garden Street (MS 50), Cambridge, MA 02138 United States
Sioris, C E (csioris@cfa.harvard.edu) , Harvard-Smithsonian Center for Astrophysics, 60 Garden Street (MS 50), Cambridge, MA 02138 United States

The Ozone Monitoring Instrument (OMI) was launched on 15 July 2004 on the EOS-Aura platform into a sun-synchronous, polar orbit with an equator crossing time of 13:45h (ascending node). OMI is a nadir-viewing near-UV/Visible spectrometer, covering the spectral region of 270 nm to 500 nm with a resolution between 0.45 nm and 1.0 nm and a nominal ground footprint of 13 km$\times$24 km. Global coverage is achieved in one day. The very high spatial resolution of OMI measurements sets a new standard for trace gas and air quality monitoring from space. Combined with daily global coverage, this significantly advances our ability to answer outstanding questions on air pollution, including the determination of BrO sources in mid and low latitudes, BrO--O$_{3}$ anti-correlations as a function of latitude, and the production of formaldehyde in cities of the developing world. We introduce the design of the OMI operational retrieval algorithm for BrO, OClO and HCHO. Based on a direct (non-DOAS) non-linear fitting approach, it includes wavelength calibration for radiances and irradiances, an undersampling correction, and the characterization of the instrument slit function. We will present results of BrO (global distribution, and tropospheric contributions from the break-up ice shelves and volcanic emissions), formaldehyde (over regions of isoprene emissions, forest fires, and heavy urban pollution), and, contingent upon the availability of suitable OMI observations, OClO (under ozone hole conditions). Where available, trace gas retrievals from OMI will be compared to results from the SCIAMACHY and GOME instruments.

A24B-05 17:15h

Aerosol Absorption measurements from OMI: Preliminary results

* Torres, O (torres@qhearts.gsfc.nasa.gov) , JCET, University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, md 21250 United States
Bhartia, P (bhartia@carioca.gsfc.nasa.gov) , NASA Goddard Space Flight Center, Code 916 NASA Goddard Space Flight Center, Greenbelt, md 20701 United States

Aerosol measurements by the Ozone Monitoring Instrument (OMI) on the AURA spacecraft will contribute new information on aerosol properties as measurements of near UV and visible backscattered solar radiation are used to quantify aerosol absorption by retrieving both the extinction optical depth and the single scattering albedo of the atmospheric aerosol load. The OMI aerosol algorithm physical basis is the strong sensitivity to particle absorption in the near UV spectral region as demonstrated by the widely known Total Ozone Mapping Spectrometer (TOMS) Aerosol Index product. Because of the extended spectral coverage of the OMI sensor as well as the finer spatial resolution, the OMI aerosol product is an improvement over its TOMS predecessor. In addition to the clear separation of absorbing aerosols (dust, smoke) from non-absorbing particles in the near UV, the combined use of visible and near UV observations in the OMI algorithm allows to differentiate desert dust aerosols from carbonaceous particles. A brief description of the OMI aerosol retrieval scheme will be presented followed by a discussion of OMI aerosol retrievals preliminary results.

A24B-06 17:30h

First Results of Total Ozone from the Ozone Monitoring Instrument (OMI) using the DOAS Method

* Veefkind, J P (veefkind@knmi.nl) , Royal Netherlands Meteorological Institute, P.O. Box 201, De Bilt, NL-3730AE Netherlands
De Haan, J F , Royal Netherlands Meteorological Institute, P.O. Box 201, De Bilt, NL-3730AE Netherlands
Bhartia, P K , NASA Goddard Space Flight Center, Mail Code 916, Greenbelt, MD 20771 United States
Yang, K , Science Applications & Systems Inc., 10210 Greenbelt Road, Suite 600, Lanham, MD 10210
Brinksma, E J , Royal Netherlands Meteorological Institute, P.O. Box 201, De Bilt, NL-3730AE Netherlands
Kroon, M , Royal Netherlands Meteorological Institute, P.O. Box 201, De Bilt, NL-3730AE Netherlands
Levelt, P F , Royal Netherlands Meteorological Institute, P.O. Box 201, De Bilt, NL-3730AE Netherlands

The Ozone Monitoring Instrument (OMI) is one of four instruments on the NASA EOS-Aura satellite, that was successfully launched on July 15, 2004. OMI is an imaging spectrometer in the ultraviolet and visible part of the spectrum (270 to 500 nm) and was contributed to the Aura mission by The Netherlands and Finland. With its unprecedented spatial resolution of 13x24 km$^2$ at nadir and daily global coverage, OMI promises highly interesting scientific results and will make a major contribution to our understanding of stratospheric and tropospheric chemistry and climate change. In this contribution we intend to present the first results of the OMI total ozone product derived using the DOAS technique. This product is one of two OMI total ozone products, the other product is based on the TOMS method. The DOAS implementation for OMI includes state-of-the-art features, such as improved methods for accounting for rotational Raman scattering and atmospheric temperature changes. These new features use the full spectral capabilities of the OMI instrument to derive the total ozone column. We anticipate to present global maps of ozone as well as results of initial validation with ground based observations. Also, we will compare with other satellite data products, such as derived from SCIAMACHY and TOMS. First comparisons between the two OMI total ozone products, derived using the DOAS and TOMS methods, will be presented. We intend to show (potential) users of the total ozone products the benefits of OMI's spatial resolution and daily global coverage.

http://www.knmi.nl/omi

A24B-07 17:45h

Coherent structures of low ozone observed by OMI and SCIAMACHY

van Velthoven, P F (velthove@knmi.nl) , KNMI (Royal Netherlands Meteorological Institute), P.O. Box 201, De Bilt, NL-3730 AE Netherlands
* Kelder, H (kelder@knmi.nl) , KNMI (Royal Netherlands Meteorological Institute), P.O. Box 201, De Bilt, NL-3730 AE Netherlands
Eskes, H (eskes@knmi.nl) , KNMI (Royal Netherlands Meteorological Institute), P.O. Box 201, De Bilt, NL-3730 AE Netherlands
Veefkind, J P (veefkind@knmi.nl) , KNMI (Royal Netherlands Meteorological Institute), P.O. Box 201, De Bilt, NL-3730 AE Netherlands
Levelt, P F (levelt@knmi.nl) , KNMI (Royal Netherlands Meteorological Institute), P.O. Box 201, De Bilt, NL-3730 AE Netherlands

The high spatial resolution observations of OMI and Sciamachy of the ozone column amount distribution provide detailed information on structures in the ozone layer. In the subtropics coherent bands of low ozone were present during a couple of days in august $2004$ in the southern hemisphere. On the basis of these observations and analysis of the potential vorticity distribution, an interpretation in terms of propagating planetary waves is put forward. This interpretation and the analysis will be enlightened. The consequences of the planetary waves on the distribution of ozone in the tropics and subtropics will be discussed.

http://www.knmi.nl/omi

Author(s) (2004), Title, Eos Trans. AGU, 85(47), Fall Meet. Suppl., Abstract #####-##.