News & Updates
February 14,2013
FY14 ROSES
JCSDA News and Newsletters
Impacts on Global Forecasts: Conventional vs Satellite Data
From the March 2013 issue of the JCSDA Quarterly
Figure 1. Analysis through day 7 die off curves of anomaly correlations for geopotential heights during (a) August - September 2010 and (b) December 2010 - January 2011. The Control is in black, the no satellite data experiment is in red and the no conventional data experiment is in green. The lower panel curves are differences with respect to the control. Lines outside the same color box are statistically significant at the 95% level.
Observing System Experiments (OSEs) are used to quantify the contributions to the
forecast made by conventional in-situ and remotely sensed satellite data.
Figure 1 shows the global mid-latitude (20° - 80° Northern and Southern Hemisphere)
average 500 hPa geopotential height anomaly correlation (AC) scores for the control
(black curve) and two experiments (NOCONV-green curve and NOSAT-red curve)
through forecast day 7. The summer results are in Fig. 1a, the winter results
in Fig. 1b. Scores lower than the control values indicate a reduction in forecast
skill when the data are removed. Note the large degradation in the forecasts
when the satellite data are deleted. The bottom portions of Figure 1 illustrate
the application of statistical significance tests.
The results are a dramatic demonstration of the importance of satellite data in NWP.
Eliminating all conventional observations results in a decrease of 6 hours in
forecast skill at day 7, but eliminating all satellite data results in an almost
3 day decrease in skill. In other words, the addition of the satellite data makes
the 7 day forecast about as skillful as the 4 day forecast without satellite data.
(Jim Jung, CIMSS/JCSDA)
See the full article in the March 2013 Quarterly Newsletter)
Newsletters supplied as PDFs
- March 2013 - No. 42 (729 KB)
- December 2012 - No. 41 (770 KB)
- September 2012 - No. 40 (864 KB)
- June 2012 - No. 39 (369 KB)
- March 2012 - No. 38 (536 KB)
- December 2011 - No. 37 (1413 KB)
- September 2011 - No. 36 (336 KB)
- June 2011 - No. 35 (811 KB)
- March 2011 - No. 34 (636 KB)
- December 2010 - No. 33 (319 KB)
- September 2010 - No. 32 (479 KB)
- June 2010 - No. 31 (369 KB)
- March 2010 - No. 30 (463 KB)
- December 2009 - No. 29 (290 KB)
- September 2009 - No. 28 (675 KB)
- June 2009 - No. 27 (511 KB)
- March 2009 - No. 26 (401 KB)
- December 2008 - No. 25 (649 KB)
- September 2008 - No. 24 (292 KB)
- June 2008 - No. 23 (320 KB)
- March 2008 - No. 22 (277 KB)
- December 2007 - No. 21 (288 KB)
- September 2007 - No. 20 (350 KB)
- June 2007 - No. 19 (312 KB)
- March 2007 - No. 18 (283 KB)
- December 2006 - No. 17 (232 KB)
- September 2006 - No. 16 (190 KB)
- June 2006 - No. 15 (383 KB)
- March 2006 - No. 14 (273 KB)
- December 2005 - No. 13 (885 KB)
- September 2005 - No. 12 (315 KB)
- June 2005 - No. 11 (406 KB)
- March 2005 - No. 10 (219 KB)
- December 2004 - No. 9 (197 KB)
- September 2004 - No. 8 (177 KB)
- June 2004 - No. 7 (211 KB)
- March 2004 - No. 6 (186 KB)
- December 2003 - No. 5 (158 KB)
- September 2003 - No. 4 (140 KB)
- June 2003 - No. 3 (72 KB)
- March 2003 - No. 2 (77 KB)
- December 2002 - No. 1 (120 KB)
Accessibility | JCSDA webmaster
Hosted for JCSDA at STAR
