takayabu 2014ppm meeting pmm... · ka$radar$(sn002)38.189n,$140.29e$ 200mheight jst 12:21( jst)...
TRANSCRIPT
JAXA GPM Science Status
Yukari N. Takayabu the University of Tokyo JAXA GPM Project Scien?st
and JAXA PMM Science Team Members
JAXA PMM Science Team
JAXA GPM Science Team : three task teams, 30 PIs 1. Algorithm Development
" BB detecEon and precipitaEon type classificaEon " DPR algorithm " Combined algorithm " PrecipitaEon Mapping GSMaP " Latent HeaEng
2. Ground ValidaEon " Ground-‐based radar, DSD, AMEDAS " PrecipitaEon Microphysics : solid, mixed, liquid
3. Science and ApplicaEons " Global PrecipitaEon Climatology " PrecipitaEon process studies à Improve numerical models " Hydrology, GEWEX à disaster prevension " PrecipitaEon data assimilaEon à Improving the weather forecast
Quick look results from science team
1. GV: GPM overpass 2. Effects of the radar sensiEvity increase Note: Current DPR product 02B is not the final version, so that values are apt to change with the final 03A. " GPM/DPR product versions
02A: previous version 02B: current version released to PIs 03A: public release version
各緯度における観測データの上限とクラッターフリーボトム
67.5⁰S-‐67.5⁰N
△2.5⁰
PR June Ku 02A June
ObservaEon range expanded both verEcally and horizontally. Upper limit of the observaEon range is >20km and higher than PR. Lower limit is slightly lower than PR.
GPM/DPR ObservaEon AlEtude Range LaEtude distribuEons M.Hirose
laEtudes
Height (km)
laEtudes
highest 99% Median 1% lowest
Highest 99% Median 1% lowest
21 April, 2014
GV at Zao Kenji Nakamura et al.
NE SW
21 April 2014 KaPR, HS mode 02A
Ka radar (SN002)38.189N, 140.29E 200 m height
JST 12:21 (JST) overpass
Ground-based Ka-radar vs. DPR (KaPR) Zao Apr 21, 2014 by Kenji Nakamura et al.
15 12 9 6 3 0
BB is captured with KaPR, MS mode (02A), but not in HS mode
Ground-based Ka-radar vs. DPR (KaPR) Zao Apr 21, 2014
Ordinate i: height from Radar (offset 220m)
one minute, 50m resolution, Located 220m height Zm should be corrected
DSD at Yamagata Dr. Yuki Kaneko
-‐0.5
0
0.5
1
1.5
2
2.5
3
3.5
4
0 1 2 3 4 5 6 7 8 9 10
N(D) [1/mm/m
^3]
D[mm]
#816 2014/4/21 12:21(JST)
DPR HS
DPR NS
KaPR HS
KaPR MS
Ku NS
パーシベル平均
DPR HS DPR NS KaPR HS KaPR MS Ku NS Parcivel mean (11min)
DSD esEmates of the uniform rain on Apr.21 are consistent with parcivel observaEons. Further observaEons are necessary.
Ka-band
X-band
31 August 2013
Time (JST) Temperature 10 Log
Z (dBZ) a.u.
0 ℃
Ka-band X-band
Fujiyoshi (2014) (under revision) Depth of darkband decreases with increasing precipitation intensity
Low-level cloud
Dark-band
0 ℃ level exists 1km above B.B. level
DetecEon of Dark Band in Ka-‐band and X-‐band Fujiyoshi 2014
Precipitation Mechanism based on ground-based instrumentations by GyuWon Lee (PI: Mi-Lim Ou)
Generation of radar composite
quality control ( ground clutter removed)
ZH bias calibration
Coordinate conversion : 3D CAPPI
3D composite of ZH
BSL GSN JNI KSN PSN SSP Z
H calibration
by self-consistency
Inter-comparison of ZH with BSL
BSL
JNI KSN PSN SSP
NetCDF
ZH
bias table
GSN
Comparison at the common grid
TRMM/PR Ground Radar
Comparison of mean profiles
for different precipitation system
Effects of radar sensiEvity increase 17dBZ (TRMM PR) à 12dBZ (GPM DPR Ka)
DetecEon of light rainfall
corrected Ze
Zm
AlEtud
es (km)
AlEtud
es (km)
Color: Ka Contours: Ku
Precursor Storm to TC Ita 0853UTC 4/4/2014 12S, 158E
ReflecEvity Profiles of the Precursor to TC Ita
corrected Ze
Zm
AlEtud
es (km)
AlEtud
es (km)
02B；Quick Look PDF (Number) vs Rainfall Intensity A-‐bin 21-‐29；15N-‐15S, AMJJ 2014
Rainfall Intensity (mm/hr) DetecEon of light precipitaEon (0.1-‐0.4 mm/hr) has been significantly improved compared with TRMM PR
Ocean
Land
NS2 NS1 TRMM
Occurrence (%
) Occurrence (%
) GPM
Hamada and Takayabu
NearSfc Effects of sensiEvity increase 12dBZ vs 17dBZ 02B NS2 o#540-‐2365 (4/3-‐7/31), 40S-‐40N,anglebin 21-‐29
16
Near-‐sfc prec rate [dBR] CumulaE
ve Freq (%
) Cu
multv Volum
e (m
m/hr*pix#)
Near-‐sfc prec rate [dBR] Near-‐sfc prec rate [dBR]
Near-‐sfc prec rate [dBR] Near-‐sfc prec rate [dBR] Near-‐sfc prec rate [dBR]
OCEAN LAND COAST
+16.2% +12.4% +12.3%
+1.24% +0.92% +0.71%
– 12dBZ – 17dBZ
Plot by Hamada
Effects of sensiEvity increase 12dBZ vs 17dBZ 02B NS2 o#540-‐2365 (4/3-‐7/29), 40S-‐40N,anglebin 21-‐29
17 Hamada and Takayabu
10km Effects of sensiEvity increase 12dBZ vs 17dBZ 02B NS2 o#540-‐2365 (4/3-‐7/31), 40S-‐40N,anglebin 21-‐29
18
10km prec rate [dBR] CumulaE
ve Freq (%
) Cu
multv Volum
e (m
m/hr*pix#)
10km prec rate [dBR] 10km prec rate [dBR]
OCEAN LAND COAST
+142.1% +67.8% +82.9%
+40.8% +12.9% +15.4%
– 12dBZ – 17dBZ
10km prec rate [dBR] 10km prec rate [dBR] 10km prec rate [dBR]
At 10km, improvements are significant, indicaEng that we can gain a lot about the cloud microphysics with GPM/DPR Hamada and Takayabu
Summary
19
" PMM science team in JAXA has started to analyze the GPM data smoothly.
" Although sEll small numbers, comparisons with ground-‐based Ka radar and disdrometer observaEons basically show good consistencies. These efforts will be conEnued with more accumulaEon of data.
" Effect of improved detecEon sensiEvity compared to TRMM PR shows a large increase in detecEon frequency
GPM on my laptop by Dr. Chris Kidd
in certain regions. " Above all, detecEons of solid phase precipitaEon and its detail structure have been significantly increased, which will provide us informaEon for microphysics.
Okinawa
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
0 1 2 3 4 5
N(D) [1/mm/m
^3]
D[mm]
#1656 2014/6/14 11:46(JST)
パーシベル10分平均 DPR NS
DPR HS
KaPR HS
KaPR MS
KuPR NS
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
0 1 2 3 4 5
#1155 2014/5/13 7:23(JST)
DPR HS
DPR NS
Ka MS
Ka HS
Ku NS
パーシベル10分平均
Okinawa case with non-‐uniform rainfall show a large discrepancy with disdrometer measurement. But good for relaEvely uniform rain.
21
Case: DetecEon of light rainfall
Case 1: Frontal precip near Japan by T. Miyoshi
Vertical sections (rain + snow + graupel)
Qr+Qs+Qg
Effects of sensiEvity increase 12dBZ vs 17dBZ 02B NS2 o#540-‐2365 (4/3-‐7/29), 70S-‐70N,anglebin 21-‐29
25
Vertical sections (rain only)
Qr
KaPR, HS mode 02A
Ground-based Ka-radar vs. DPR (KaPR) Zao Apr 21, 2014
Ground-‐based Ka-‐radar: one minute, 50 m resoluEon
NE SW
21 April 2014 KaPR, MS mode 02A
Ka radar (SN002)38.189N, 140.29E 200 m height
JST 12:21 (JST) overpass
GV site overpass at Zao Apr 21, 2014
15 12 9 6 3 0
