# Presentation: 111972

## NAMAP2

**(see much more in the CPC Atlas and *****BAMS***** paper)**

**NAMAP2**
**A multi-model assessment of North American Monsoon simulations**** **

_**Introduction**_
- NAMAP2 is a coordinated exercise in global and regional atmospheric modeling of the North American Monsoon System (NAMS). The summer season of 2004 (during which the NAME 2004 field campaign took place) is the simulation target. A preliminary discussion among potential participants to develop simulation protocols has just been completed and runs will be carried out over the next several months with analysis to follow immediately. **The NAMAP2 project timeline is shown in the box to the right.**
- The first NAME Model Assessment Project (NAMAP) was an attempt to engage the modeling community in advance of the NAME 2004 field campaign.  NAMAP provided an indication of the ability of numerical models to simulate atmospheric variability across southwestern North America during the summer season.  For NAMAP, numerical simulations of atmospheric variability across southwestern North America during a single summer (1990) were carried out independently by six modeling groups.  The NAMAP analysis focused on the ability of the models to simulate the observed seasonal and (where observations permitted) diurnal cycles. The results provided motivation for enhanced observations in data-poor areas during the NAME 2004 Field Campaign and led to the formulation of metrics to quantify model simulation quality and improvement (CPC Atlas online 2004; Gutzler et al. 2005, in press in *BAMS*).
- NAMAP2 will re-examine the metrics proposed by NAMAP, extend the NAMAP analysis to transient variability, and exploit the extensive observational database provided by NAME 2004 to analyze simulation targets of special interest. A centralized comparative analysis of model output will be carried out at the NOAA Climate Prediction Center once the simulations are complete, and we hope that the simulations will be used by individual modeling groups as Control Runs for their own analysis purposes.
- Oceanic temperature data and (for regional models) lateral boundary conditions will be specified. The first phase of NAMAP, and other studies of the North American Monsoon, have indicated the sensitivity of the results to proper specification of SSTs in the Gulf of California. Motivated by this need, a new SST analysis has been developed for NAMAP2, as described in the lower right box.
**New participants are welcomed! Online registration at the NAMAP2 web page**

**For More Information: contact Dave Gutzler ****	**
**NAMAP CPC Atlas:     http://www.cpc.ncep.noaa.gov/research_papers/ncep_cpc_atlas/11/index.html**
**NAMAP2 web page:   http://www.joss.ucar.edu/name/namap2**

**David S. Gutzler (and NAMAP2 collaborators)**
**University of New Mexico**
***gutzler@unm.edu***

**Pingping Xie and Wanqiu Wang**
**NOAA/NCEP/Climate Prediction Center**
***pingping.xie@noaa.gov     wanqiu.wang@noaa.gov***

_**A new **__**Multi-Platform-Merged (MPM) **__**SST analysis for NAME and NAMAP2**_**  (Xie & Wang)**
- The first phase of NAMAP, and other studies of the North American Monsoon, have indicated the sensitivity of the results to proper specification of SSTs in the Gulf of California. Motivated by this need, a new SST analysis has been developed for NAMAP2 and other NAME research.
_**Resolution**_**:**	  0.25° in space, 3-hour in time 					_**Input data**_**:**  In situ observations (buoys and ships)
_**Domain**_**:**	  180°–30°W, 30°S–60°N (embedded within global OI analysis)		  Satellites:  GOES, TMI, AMSR, NOAA-16, NOAA17
_**Target Period**_**:**  2001–present (summer 2004 completed)		_**Fields merged via Optimum Interpolation after Bias Correction**_

**Mean differences (K)**
**between analyses**
**Jun 1-Aug 31, 2004**

**Input SST fields**
**Apr-May-Jun 2004**

- 8/day
- clear sky

- 2/day
- clear sky

- 2/day
- clear sky

- 2/day
- all sky

- 2/day
- all sky

**Mean difference (K)**
**between analyses and**
**in situ observations**
**Jun 1-Aug 31, 2004**

_**NAMAP2 Protocols and Timeline**_** (see NAMAP2 web page for details)**

**Time Series of **
**3-Hourly SST**
**109.875****o****W; 26.125****o****N**

- Seasonal progression of
- monthly precipitation in the
- CORE and AZNM subdomains

- Monthly-average diurnal cycle
- of precipitation in the
- CORE and AZNM subdomains

- NAMAP was initiated to provide
- benchmark simulations of a representative warm season across Tier 1, prior to the NAME 2004 field campaign

-  Both global models exhibit delays in monsoon onset and peak precip
-  Big discrepancies in nocturnal precipitation as well as daytime
-     convective peak

- Six modeling groups
- (running 4 regional models and 2 global models) carried out the simulations of the 1990 warm season

**All NAMAP output is freely available at http://www.joss.ucar.edu/name/namap**

- Monthly-average diurnal cycle
- of latent flux in AZNM
-  Huge range, poorly constrained
-     by observations. Similar results
-     obtained for sensible flux.

**NAMAP-derived goals for model improvement include:**
*** Simulate observed monsoon onset within a week**
*** Simulate monthly mean precipitation to within 20%**
*** Simulate large scale surface fluxes to within 20%**
*** Correctly simulate the diurnal cycle of convective and **
**	****nonconvective precip**

**Output Archiving Protocols ****(8 Sept 05 revision)**

**Simulation Timeline **(**22 June 2005 revision****)**** **

**Simulation Guidelines** (**22 June 2005 revision****)**

_**a) For spatial analysis:**_
**Archive lat-lon fields covering the NAMAP2**
**domain every 3 hours (8/day) during the simulation period. Fields to archive:**

_**b) For high-resolution temporal analysis:**_
**Archive "MOLTS"-style time series (at least hourly in time and full vertical resolution). We will consider surface fluxes and profiles of humidity, T, u, v, w, p, resolved and convective precipitation, cloud fraction, radiation, and turbulence at model grid points corresponding to the following NAME sounding sites:**** **

**NAMAP2 spatial analysis will focus on **
**uncertainties identified in NAMAP, with **
**additional emphasis on verification**
**using enhanced observations from the**
**NAME 2004 field campaign. Moisture **
**transport and land surface hydrology**
**will be assessed in detail. **

**NAMAP2 will extend the descriptive**
**analysis of NAMAP with a process-**
**oriented analysis of model output at**
**NAME 2004 sounding sites. This**
**component of the analysis is focused**
**on cloud and precipitation processes. **

**With the recent completion of the MPM SST analysis for summer 2004 (below),  we are ready to begin the NAMAP2 simulations. Analysis of the simulations will begin in several months. NAMAP2-based publications will include full joint authorship (as in NAMAP). **
**                  **_**** Please join us! ****_

**Participants have expressed tentative interest **
**in repeating the analysis for the 2005 season**

**These differences are currently being diagnosed, but at first glance they seem quite consistent with what we would expect from an ****improved**** analysis ... as suggested by the small bias of MPM relative to in situ data.**