Post on 05-Feb-2016
description
Overview of IHOP-FRA activitiesincluding LEANDRE 2 analyses
IHOP_2002 Spring Science Workshop24-26 March 2003
NCAR, Foothills Laboratory, Boulder, CO
Overview of IHOP-FRA activities
1. Teams and objectives of IHOP2. LEANDRE 2 contribution3. IHOP-FRA priority days4. Activities envolving LEANDRE 2
• 20 June ELLJ/Bore case• CI-related activities• BLE-related activities• BLH-related activities (poster by J. Tarniewicz)• Intercomparison exercise (oral by Behrendt)
5. Other activities• GPS (oral by J. van Baelen)• Modelling (poster by F. Couvreux)
Teams and objectivesof IHOP-FRA
Teams and objectifs of IHOP-FRA
3 TEAMS (CNRS/METEO-FRANCE):• LEANDRE 2: L2 operation during IHOP, L2 data processing andanalysis• GPS: operation of 7 GPS receivers, processing and analysis• Modelling: Meso-NH and MM5 simulations (LES, CRM)
3 TRANSVERSE RESEARCH THEMATICS :• Theme 1 : ABL processes; secondary circulations in the ABL;WV heterogeneities in the ABL and its connections with surfaceheterogeneities• Theme 2 : Morphology of drylines and breeze-like circulations• Theme 3 : Convective initiation; moisture transport into MCSs;Diurnal cycle of convection
LEANDRE 2 contributionto IHOP_2002
DIAL H2O LEANDRE 2
Standard processing: 100 shots (10 sec.) 800 m horizontal resolution 300 m vertical resolution
Precision:0.05-0.1 g kg-1 at 3.5 km0.3-0.4 g kg-1 near surface
Bias RMS / RSD:0.15 g kg-1
LEANDRE 2 in the NRL P-3•Sideway pointing in the ABL•Vertical pointing (nadir or zenith)• coupling with ELDORA clear air measurements
Radom ELDORA
L2 mirror fairing
LEANDRE 2 operations during IHOP
142 h scientific flights
•Boundary-Layer Heterogeneity*: 7 missions / 35h28•Boundary-Layer Evolution**: 3 missions / 21h16•Convective Initiation**: 12 missions / 73h18•Evening Low-Level Jet*: 2 missions / 11h19
*nadir pointing**horizontal pointing
CI:•Tammy W., Dave K., Hanne M., and Roger W. : 10, 12, and 19 June cases,•Wen-Chau and Huaqing: 9 and 11 June cases.
Bore: Steve K. and the “Bore science Team”: 20 June case
BLE: Tammy W.: 14 June case
BLH: Ken D. and Ken C.: all cases
Quality LEANDRE data / high scientific interest (12/24):• BLH: 27 May; 29 May; 07 June• BLE: 14 June; 21 June; 25 June IHOP-FRA priorities• ELLJ: 07-08 June; 20 June • CI: 10 June; 12 June; 15 June; 19 June
LEANDRE 2 golden days
Collaborations (ongoing/anticipated)
LEANDRE 2 processing
terrain
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4
3
2
LEANDRE 2 scientists:C. Flamant, K. Lhomme (PhD), and T. Weckwerth
with support from:P. Genau (CNRS) and C. Pettet (NCAR)
CNRS:• Horizontal data processing: K. Lhomme and C. Flamant(Analyses are conducted by Karen as part of her PhD)• Nadir data processing: C. Flamant
Analyses envolving LEANDRE 2
ELLJ/Bore related activities20 June 2002 case
ELLJ/Bore-related activities
terrain
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Objectives:• Study the life cycle of a bore event,• Compare observations with hydraulic theory,• Understand the role of bores in nocturnal convectionmaintenance,• Water vapor budget,• Validatation for high-resolution numerical simulations.
Means/instruments:• WSR-88D radars (triggering mechanisms),• L2+S-POL (temporal evolution),• Profiling in Homestead (break-down),• Dropsondes• MANDOP-type 3DVAR analyses –including ELDORA, S-POL,DDC radar and L2 (MCS dynamics, budgets).
ELLJ mission 20 June 2002
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ELLJ mission 20 June 2002
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LEANDRE 2Temporal evolution
0408 UTC
0329 UTC
0555 UTC
S-POL
WV profiles south ofthe MCS
Dropsonde
LEANDRE 2
WV profiles close the MCS
Dropsonde
LEANDRE 2
BLE- related activities14 and 21 June 2002
BLE-related activities
terrain
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Objectives:• Analyze water vapor variability evolution with time,in connection with the entrainment process,• Investigate relationships between water vapordistribution dynamical structures in the ABL (rolls, cells),• Provide some sort of validation for LES and high-Resolution “real case” simulations,
Means/instruments:•Large Eddy Simulations• Idealized 3-D simulations• Real case simulations• IHOP data (including S-POL, ELDORA, DIALs)• MANDOP-type 3DVAR analyses
BLE mission 14 June 2002
terrain
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BLE mission 14 June 2002
LEANDRE 2: sideway pointing in the ABL
Blind zone
BLE mission 14 June 2002
Also see Fleur’s Poster!!
• Present the existing diagnostic tools for water vaporvariability analyses using the mesoscale model Meso-NH• Verify wether Meso-NH can simulate the observed watervapor variability,• Use the diagnostic tools to identify the origin of watervapor variability.
BLH- related activities29 June 2002
BLH-related activities
terrain
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Objectives:• Analyze east-west water vapor variability, in connectionwith the entrainment process and soil moisture,• Analyze the impact of small scale water vaporvariability on GPS IWV retrievals
Means/instruments:• Real case simulations• IHOP data (including S-POL, ELDORA, DIALs, GPS)• MANDOP-type 3DVAR analyses
Also see Jerome’s Poster!!
CI- related activities10, 12, 15 and 19 June 2002
Objectives:• better understand CI in connection with ABL processes,surface heterogeneity, dryline morphology andbreeze-like circulations,• analyze the role of « lateral entrainment » process,• explore the role of moisture “pockets” resulting from Cudissipation on CI,• assess whether dry air intrusion mechanisms inhibit CIas they do in the Tropics• analyze the transition between shallow and deepconvection and the role of the moisture field above the ABLMeans:• Large Eddy Simulations• Idealized 3-D simulations (front, triple point)• Real case simulations• IHOP data (L2, AERI, MAPR, RDS, FM-CW, S-POL)
CI-related activities
CI mission 19 June 2002
terrain
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CI mission 19 June 2002
LEANDRE 2: sidewaypointing in the ABL through a « dry-line »
Blind zone
P-3 flying at 1500 m
Intercomparison exercise8 June 2002
Objective: Intercomparison of DLR, NASA andCNRS DIAL measurements
CI-related activities
Activities conducted in the framework of theESA project coordinated by V. Wulfmeyer
I would like to propose that we do not just compareprofiles and performance, but have the differentgroups PROCESS the data from other groups (thereis a lot to learn in this process).
Assessement of the algorithms performances, not justinstruments performances