Validation of the JRA-55 based data set: Comparison with buoy observations
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1 Validation of the JRA-55 based data set: Comparison with buoy observations Hiroyuki TOMITA (Nagoya University) OMDP extended meeting
2 Objectives IN SITU BUOY DATA VS VS VS JRA-55 v0.1 VS JRA-55 v0.3 VS OTHERS How improve? Which is better?
3 Outline JRA-55 based data Other reanalysis and satellite based data Buoy observation data Flux calculation/ Comparison strategy Results
4 Versions of JRA-55 base data Ver 0.1: unadjusted JRA55 Ver 0.2: adjusted JRA55 (Mar 2015) Ver 0.3: adjusted JRA55 (Dec 2015)
5 Versions of JRA-55 base data Ver 0.1: unadjusted JRA55 Ver 0.2: adjusted JRA55 (Mar 2015) Ver 0.3: adjusted JRA55 (Dec 2015)
6 Other reanalysis and satellite based data NRA-1: NCEP/NCAR reanalysis Kalnay et al. (1996) J-OFURO3: satellite-derived air-sea flux Preliminary version (V0.0.4, not public yet) OAFlux: satellite and reanalysis air-sea flux Yu and Weller (2007)
7 JRA-55 NRA-1 J-OFURO3 OAFlux spatial grid TL319 (~55km) T62 (~180km) 0.25 degree 1.0 degree temporal 3-hourly 6-hourly daily daily wind vector vector scalar scalar scalar scalar daily daily
8 Variables: name description unit LHF latent heat flux W/m 2 SHF sensible heat flux W/m 2 WND scalar wind speed m/s QA specific humidity g/kg TA air-temperature deg.c SST sea surface temperature deg.c
9 Buoy observation data 104 buoys over the global oceans TAO/TRITON NDBC KEO/JKEO PIRATA RAMMA
10 Buoy observation data 104 buoys over the global oceans TAO/TRITON NDBC KEO/JKEO PIRATA RAMMA Hourly or 10 min. data Daily mean data
11 Flux calculation COARE 3.0 Fairall et al Without any corrections for skin temperature COMMON to all flux calculations in PRODUCTS and BUOY Input: daily means for each variable and obs. height WND QA TA SST COARE 3.0 Output LHF SHF
12 Direction of flux positive = upward negative = downward
13 Comparison with buoy daily mean basis Period: from 1 January 2008 to 31 December 2008 Match-up: match-up data were obtained from global gridded data by linear interpolation at buoy location Obs. Height difference: unified to value at 10m by COARE 3.0 Statistics: BIAS (PRODUCT minus BUOY) RMSD
14 Results name description unit LHF latent heat flux W/m 2 SHF sensible heat flux W/m 2 WND scalar wind speed m/s QA specific humidity g/kg TA air-temperature deg.c SST sea surface temperature deg.c
15 JRA-55 v0.1 NRA1C JRA-55 v0.3 J-OFURO3 Preliminary
16 JRA-55 v0.1 NRA1C JRA-55 v0.3 J-OFURO3 Preliminary
17 JRA-55 Ver. 0.1 BIAS LHF W/m 2
18 JRA-55 Ver. 0.3 BIAS LHF W/m 2
19 J-OFURO3 BIAS LHF W/m 2
20 OAFlux BIAS LHF W/m 2
21 JRA-55 Ver. 0.1: LHF EQ EQ Latitude [deg]
22 JRA-55 Ver. 0.3: LHF EQ EQ Latitude [deg]
23 NRA-1: LHF EQ EQ Latitude [deg]
24 J-OFURO3: LHF EQ EQ Latitude [deg]
25 OAFlux: LHF EQ EQ Latitude [deg]
26 Results name description unit LHF latent heat flux W/m 2 SHF sensible heat flux W/m 2 WND scalar wind speed m/s QA specific humidity g/kg TA air-temperature deg.c SST sea surface temperature deg.c
27 JRA-55 Ver. 0.1 BIAS SHF W/m 2
28 JRA-55 Ver. 0.3 BIAS SHF W/m 2
29 JRA-55 Ver. 0.1: SHF EQ EQ Latitude [deg]
30 JRA-55 Ver. 0.3: SHF EQ EQ Latitude [deg]
31 NRA-1: SHF EQ EQ Latitude [deg]
32 Results name description unit LHF latent heat flux W/m 2 SHF sensible heat flux W/m 2 WND scalar wind speed m/s QA specific humidity g/kg TA air-temperature deg.c SST sea surface temperature deg.c
33 JRA-55 Ver. 0.1 BIAS WND m/s
34 JRA-55 Ver. 0.3 BIAS WND m/s
35 JRA-55 Ver. 0.1: WND EQ EQ Latitude [deg]
36 JRA-55 Ver. 0.3: WND EQ EQ Latitude [deg]
37 Results name description unit LHF latent heat flux W/m 2 SHF sensible heat flux W/m 2 WND scalar wind speed m/s QA specific humidity g/kg TA air-temperature deg.c SST sea surface temperature deg.c
38 JRA-55 Ver. 0.1 BIAS QA g/kg
39 JRA-55 Ver. 0.3 BIAS QA g/kg
40 JRA-55 Ver. 0.1: QA EQ EQ Latitude [deg]
41 JRA-55 Ver. 0.3: QA EQ EQ Latitude [deg]
42 Results name description unit LHF latent heat flux W/m 2 SHF sensible heat flux W/m 2 WND scalar wind speed m/s QA specific humidity g/kg TA air-temperature deg.c SST sea surface temperature deg.c
43 JRA-55 Ver. 0.1 BIAS TA g/kg
44 JRA-55 Ver. 0.3 BIAS TA g/kg
45 JRA-55 Ver. 0.1: TA EQ EQ Latitude [deg]
46 JRA-55 Ver. 0.3: TA EQ EQ Latitude [deg]
47 Results name description unit LHF latent heat flux W/m 2 SHF sensible heat flux W/m 2 WND scalar wind speed m/s QA specific humidity g/kg TA air-temperature deg.c SST sea surface temperature deg.c
48 JRA-55 COBE SST BIAS SST C
49 Summary Variable v0.1 v0.3 LHF positive bias improved SHF positive bias improved WND Tropics: negative bias High lat: positive bias negative bias QA dry bias improved TA cold bias improved SST large bias in mid-latitude
50
51 Validation of the JRA-55 based data set: Comparison with buoy observations Appendix
52 JRA-55 Ver.0.2: LHF
53 JRA-55 Ver.0.2: LHF EQ EQ Latitude [deg]
54 JRA-55 (32N, 146.5E)
55 (32N, 146.5E)
56 J-OFURO3 (32N, 146.5E)
57 JRA-55 Ver. 0.3 BIAS LHF W/m 2
58 JRA-55 ORG NRA1C number of data : 363 Buoy average : Satellite average : Bias : RMS error : Correlation : Regression : * x number of data : 363 Buoy average : Satellite average : Bias : RMS error : Correlation : Regression : * x JRA-55 v0.2 J-OFURO3 Preliminary number of data : 363 Buoy average : Satellite average : Bias : RMS error : Correlation : Regression : * x number of data : 297 Buoy average : Satellite average : Bias : RMS error : Correlation : Regression : * x LHF@0n156e
59 JRA-55 ORG NRA1C number of data : 363 Buoy average : Satellite average : Bias : RMS error : Correlation : Regression : * x number of data : 363 Buoy average : Satellite average : Bias : RMS error : Correlation : Regression : * x JRA-55 v0.3 J-OFURO3 Preliminary number of data : 363 Buoy average : Satellite average : Bias : RMS error : Correlation : Regression : * x number of data : 297 Buoy average : Satellite average : Bias : RMS error : Correlation : Regression : * x LHF@0n156e
60 JRA-55 Ver. 0.3 BIAS LHF W/m 2
61 JRA-55 v0.1
62 JRA-55 v0.3
63 J-OFURO3
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