Merged Sounding VAP - arm.gov · What is Merged Sounding? Merged Sounding is a Value Added Product...
1
Improvements and Changes to the Merged Sounding VAP David Troyan and Mike Jensen, BNL Jim Mather and Sally McFarlane, PNNL Eli Mlawer and Jennifer Delamere, AER, Inc. Mark Miller, Rutger University Dave Turner, University of Wisconsin Jay Mace, University of Utah Merged Sounding Data Availability SGP: NSA: TWP Manus: TWP Nauru: TWP Darwin: 2000 - 2005 2004 - 2007 2006 2004 - 2006 2002 - 2006 Two versions of Merged Sounding exist. The original version is continuing to be run for all permanent sites; the second version is in development but has been run for Point Reyes and Niamey Merged Sounding has been run for each site for the following times: The following changes to the original version have been incorporated into a beta edition of Version II: 1. Altitude extends to 60 km (instead of 20 km) AGL. This increases the number of height levels from 266 to 315. The basis for this change is that typical ECMWF height exceeds 60 km AGL. 2. ECMWF temperature has been adjusted at altitudes between 100 mb and 1 mb. The basis of this change is DY Wang et. al., 2005. 3. Radiosonde Dry-Bias correction has been implemented. This correction applies to the dry-bias adjustments for Vasiala RS-92 Radiosondes. See T Hume and L Miloshevich, 2007 and H. Vomel et. al., 2007. PYE: NIM: 4/20/05 - 9/15/05 1/10/06 - 1/7/07 Version I (Original) Version II (Beta) New Features of Version II Comparisons between Merged Sounding and Other Thermodynamic Profile PI Products Mixing Ratio (g/kg) Differences Temperature (C) Differences SGP (3-4/2000) Mace Darwin (TWP-ICE) Mather Nauru (4-5/1999) Mather Manus (4-5/2000) Mather Key: Blue -- Median; Red -- 25th and 75th Percentile; Black -- 10th and 90th Percentile What is Merged Sounding? Merged Sounding is a Value Added Product that represents the thermodynamic atmospheric profile at one-minute intervals. It incorporates radiosonde, ECMWF, MWR, and surface data to create profiles from ground level to 20 km AGL. km Above Ground Level km Above Ground Level km Above Ground Level km Above Ground Level Merged Sounding-Mather (g/kg) Merged Sounding-Mather (C) Merged Sounding-Mace (C) Merged Sounding-Mace (g/kg) Sondes Daily Launches: 4 at Darwin, 2 each at Nauru and Manus, 4-6 at SGP. Merged Sounding is Drier: at low levels compared to Mace and Mather at Nauru. Merged Sounding is Moister: at low levels compared to Mather at Manus & Darwin. Merged Sounding is Cooler: at high levels compared to Mather at Nauru & Manus.
Transcript of Merged Sounding VAP - arm.gov · What is Merged Sounding? Merged Sounding is a Value Added Product...
Improvements and Changes to theMerged Sounding VAP
David Troyan and Mike Jensen, BNLJim Mather and Sally McFarlane, PNNLEli Mlawer and Jennifer Delamere, AER, Inc.
Mark Miller, Rutger UniversityDave Turner, University of Wisconsin
Jay Mace, University of Utah
Merged Sounding Data Availability
SGP:NSA:TWP Manus:TWP Nauru:TWP Darwin:
2000 - 20052004 - 200720062004 - 20062002 - 2006
Two versions of Merged Sounding exist. The original version is continuing to berun for all permanent sites; the second version is in development but has been runfor Point Reyes and Niamey Merged Sounding has been run for each site for thefollowing times:
The following changes to the original version have been incorporatedinto a beta edition of Version II:
1. Altitude extends to 60 km (instead of 20 km) AGL. This increases the number of height levels from 266 to 315. The basis for this change is that typical ECMWF height exceeds 60 km AGL.
2. ECMWF temperature has been adjusted at altitudes between 100 mb and 1 mb. The basis of this change is DY Wang et. al., 2005.
3. Radiosonde Dry-Bias correction has been implemented. This correction applies to the dry-bias adjustments for Vasiala RS-92 Radiosondes. See T Hume and L Miloshevich, 2007 and H. Vomel et. al., 2007.
PYE:NIM:
4/20/05 - 9/15/051/10/06 - 1/7/07
Version I (Original) Version II (Beta)
New Features of Version II
Comparisons between Merged Sounding andOther Thermodynamic Profile PI Products
Median Differences -- Blue Line,25th and 75th percentiles -- Red Lines,10th and 90th percentiles -- Black Lines.
Mixing Ratio (g/kg)Differences
Temperature (C)Differences
SGP
(3-4
/200
0)M
ace
Dar
win
(TW
P-IC
E)M
athe
rN
auru
(4-5
/199
9)M
athe
rM
anus
(4-5
/200
0)M
athe
r
Key: Blue -- Median; Red -- 25th and 75th Percentile; Black -- 10th and 90th Percentile
What is Merged Sounding?
Merged Sounding is a Value Added Product that represents the thermodynamicatmospheric profile at one-minute intervals. It incorporates radiosonde, ECMWF, MWR, and surface data to create profiles from ground level to 20 km AGL.
km A
bove
Gro
und
Leve
lkm
Abo
ve G
roun
d Le
vel
km A
bove
Gro
und
Leve
lkm
Abo
ve G
roun
d Le
vel
Merged Sounding-Mather (g/kg) Merged Sounding-Mather (C)
Merged Sounding-Mace (C)Merged Sounding-Mace (g/kg)
Sondes Daily Launches: 4 at Darwin, 2 each at Nauru and Manus, 4-6 at SGP.
Merged Sounding is Drier: at low levels compared to Mace and Mather at Nauru.Merged Sounding is Moister: at low levels compared to Mather at Manus & Darwin.
Merged Sounding is Cooler: at high levels compared to Mather at Nauru & Manus.
