Meteorological Data Plot Acces
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Standard Daily Potential Vorticity and Temperature Maps
Daily maps of potential vorticity (PV) and temperature from
* NASA's Global Modeling and Assimilation Office
(GMAO) Goddard Earth Observing System (GEOS) Versions 4.03 (GEOS-4) analyses (Bloom et
al., 2005).
* The UK Met Office's
Stratosphere Troposphere Assimilation System (Swinbank
and O'Neill, 1994; Swinbank et al., 2002), distributed
by the British Atmospheric Data Center (BADC).
Maps show PV (left two columns) and temperature (right two columns) in the upper (1700 K, 1 hPa), middle (850/840 K (GEOS-4/MetO), 10 hPa), and lower (490/520 K, 50/46 hPa (GEOS-4/MetO)) stratosphere, on NH (left) and SH (right) polar projections. PV is in units of 10e-4 K m^2 (kg s)^-1; temperature is in K. PV maps have horizontal wind vectors overlaid. PV from the Met Office data are calculated as described by Manney et al. (1996), using routines adapted from those described by Newman et al. (1989). PV from GEOS-4 is from their analyses, calculated within the assimilation system, as provided in that dataset. The map projection is orthographic, with 0 deg longitude at the bottom/top in the NH/SH and 90 deg E to the right.
Note that the contour intervals for the NH and SH may be
different; there are "summer" and "winter" scales for both PV
and temperature. "Summer" colors are used in the NH during
May through September. Since winter-like conditions persist
so much longer in the SH, "summer" colors are used there only
during January through March.
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Standard Daily UTLS Maps
Daily maps of several quantities describing the upper
troposphere/lower stratosphere (UTLS) region. Maps are taken
from or derived from NASA's Global Modeling and Assimilation
Office (GMAO)
Goddard Earth Observing System (GEOS) Versions 4.03 (GEOS-4)
analyses
(Bloom et al., 2005).
The eight panels show:
1. 250 hPa geopotential height (GPH, km) and windspeed (m/s)
from GEOS-4.
2. Temperature gradient tropopause, calculated as
described by Reichler et al. (2003) using the World
Meteorological Organization (WMO) definition.
3 and 4. Potential Vorticity (PV, 10e-4 K m^2 (kg s)^-1)
from GEOS-4. White line(s) show(s) PV value(s) commonly
used to define the extra-tropical tropopause.
5. Cold Point Temperature (K) from GEOS-4. Contours are
overlaid at #K intervals for temperatures less than XXX K.
6. Diabatic heating rates (dT/dt, K/d) from GEOS-4;
postive values (ascent) are outlined in white.
7. 200 hPa divergence (colors, 1/s) calculated from
GEOS-4 analyses. Overlaid in grey are contours of negative
omega (dp/dt, the vertical velocity in pressure coordinates,
Pa/s), indicating ascent.
8. 200 hPa velocity potential (10e-7 m^-2 s^-1) calculated
from GEOS-4 analyses, with overlaid wind vectors (m/s).
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References:
- Bloom, S. C., et al., The Goddard Earth Observing Data
Assimilation System, GEOS DAS Version 4.0.3: Documentation
and validation, Tech. Rep. 104606 V26, NASA.
- Manney, G. L., R. Swinbank, S. T. Massie, M. E. Gelman,
A. J. Miller, R. Nagatani, A. O'Neill, and R. W. Zurek,
Comparison of U.K. Meteorological Office and U.S. National
Meteorological Center stratospheric analyses during northern and
southern winter, J. Geophys. Res., 101, 10,311--10,334, 1996.
- Newman, P. A., L. R. Lait, M. R. Schoeberl, R. M. Nagatani, and
A. J. Krueger, Meteorological atlas of the Northern Hemisphere
lower stratosphere for January and February 1989 during the
Airborne Arctic Stratospheric Expedition, Tech. Rep. 4145,
NASA, 1989.
- Reichler, T., M. Dameris and R. Sausen, Determining the
tropopause height from gridded data, Geophys. Res. Lett., 30,
2042, doi:10.1029/2003GL018240, 2003
- Swinbank, R., and A. O'Neill, A stratosphere-troposphere data
assimilation system, Mon. Weather Rev., 122, 686--702, 1994.
- Swinbank, R., N. B. Ingleby, P. M. Boorman, and R. J. Renshaw,
2002: A 3D variational data assimilation system for the
stratosphere and troposphere. Tech. Rep. 71, Met Office
Numerical Weather Prediction Forecasting Research Scientific
Paper.
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