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

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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

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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

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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

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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

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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

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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