Application of CMAQ with RAMS to air quality in the Osaka area in Japan

CMAS workshop 　 02/10/23

＊ Seiji Sugata, Shinji Wakamatsu (NIES) Toshimasa Ohara (Shizuoka Univ.) Itsushi Uno (Kyushu Univ.) (*e-mail: sugatas@nies.go.jp)

Two main contents ・ Use of RAMS for CMAQ ・ Application to the Osaka area in Japan (preliminary result)

Difference of MM5 and RAMS

MM5 RAMSTechnically points Grid system Arakawa-E Arakawa-C Map projection Lambert Polar-stereo Vertical coordinate sigma-p sigma-z

Scientific Hard to say in one sentence Each strong and weak points

Users Many Many Most popular regional met. models

License Free Necessary

A wide choice of meteorological models for input to CMAQ → 　 increasing flexibility of CMAQ application

CMAQ-RAMS interface history

－　 Original idea by Byun and Uno 1999 Interface for CMAQ 1999 and RAMS3b 　　　 developed by Byun and Sugata　 2000 updated for RAMS4.3 (↓ 　 Sugata) 2002 updating for CMAQ 2001 　　　　　　　　　　　 updating for CMAQ 2002 (MCIP2)

available

preparing

Main routines of RAMS

(version 4.3)

modified MCIP

REVU(RAMS Evaluation and

Visualization Utility)Modified dumpout.f

postprocessing routine

CMAQ CTM

Data flow in the interface

Met. data in GTOOL format

Met. data in I/O API format

RAMS2IOAPI

Air quality observation campaign in Osaka

Tokyo

Osaka Osaka Bay

Aircraft

Surface

One month for March, 2001 surface 0m, 60m concentrations of SO2, NOx, Ox, PMs, etc. and high volume sampling for aerosols aircraft 19,20,21,23 March, 2001 concentrations of SO2, NOx, Ox, PMs, etc. and high volume sampling for aerosols

Application of CMAQ/RAMS to the OSAKA area

Calculation Period: Mar.15-24,2001 (Aircraft measurement Mar. 19, 20, 21, 23) Resolution: 5km mesh (Polarstereo) 21 layers from 25m up to 19km, interval starts from 50m Domain: Greater Osaka area (next slide) no-nesting RAMS 300km square CMAQ 200km square

Emission 1998 data by the Ministry of the environment (10km mesh)

Models RAMS4.3 assimilation by ECMWF 0.5 degree mesh 4 times per day CMAQ 1999 ver.

Domain for CMAQ (200km square)

Domain for RAMS (300km square)

Nudging by ECMWF one hour at edges two days inside

Met. data

Emissions (NO and SO2)

CMAQ vs. Obs. (Osaka) ○ 　 62m obs. ● surface obs. Solid lines: CMAQ

NO2 O3

NOx SO2

NO2 (time series and scatter diagrams)

NOx (time series and scatter diagrams)

NO (time series and scatter diagrams)

O3 (time series and scatter diagrams)

SO2 (time series and scatter diagrams)

Vertical profile of concentration of SO2 along the flight path (Red: CMAQ)

Comparison of wind velocity and direction between RAMS and observation at five observational sites, Osaka and neighboring four sites.

Wind velocity and direction RAMS vs. Obs.(Black: RAMS Red: Observation)

Osaka

Kobe(west ofOsaka)

Velocity Direction

Wind velocity and direction (RAMS vs. Obs.)Black: RAMS Red: Obs.

Toyonaka (north of Osaka)

Sakai(southofOsaka)

Velocity Direction

Scatter diagram for wind velocity at Osaka

Obs.

RAMS

Met. Field (Obs.-RAMS) Osaka Kobe Toyonaka Sakai Ikomayama

Velocity 0.61 0.37 0.61 0.53 　　　　　　 0.59（ Day/Night) 0.68 / 0.17 0.51 / 0.14 0.61 / 0.28 0.64 / 0.13 0.61 / 0.44

Direction 0.37 0.33 0.08 0.60 0.49（ Day/Night) 0.33 / 0.38 0.45 / 0.26 0.11 / 0.12 0.50 / 0.54 0.52 / 0.46

Gas concentrations (Obs.-CMAQ) NO2 Ox SO2

0.33 0.51 0.13 　　　　　　　　　(Day/Night) 0.16 / 0.34 0.36 / 0.11 0.16 / 0.05

Summary of correlation coefficients

→ 　 concentrations <similar coefficients> directions

Summary

- Developing MCIP-RAMS interfaces.

- Simulated air quality in the Osaka area in March 2001 using CMAQ and RAMS- Compared gas concentrations between CMAQ and observations (surface and aircraft).- Compared wind velocity and direction between RAMS and observations.- Simulations reproduce essentially orders of observational concentrations but still show quantitative disagreement.- RAMS wind fields strong wind for night calm air better in velocity and worse in direction

Next

-Development of the interface for MCIP2-Ready for distribution for those who are interested in-Interested in learning MM5

-To get more realistic RAMS results-One or two more nesting domains 　 to consider long-range transport-Others