MM5 SIMMULATIONS OF SFBA TO SAC/SJV TRANSPORT DURING 30 JULY- 2 AUG 2000 CCOS OZONE EPISODE
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MM5 SIMMULATIONS OF SFBA TO SAC/SJV TRANSPORT DURING 30 JULY- 2 AUG 2000 CCOS OZONE EPISODE by Tesfamichael B. Ghidey: LBNL, SJSU, DRI. OUTLINE. SYNOPTIC SUMMARY 700 MB SFC MM5 CONFIGURATION WINDS: MESO CONVENTION FULL BARB = 1 M/S FLAG = 5 M/S RESULTS DOMAIN 1: SYNOPTIC WINDS

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Mm5 simmulations of sfba to sac sjv transport during 30 july 2 aug 2000 ccos ozone episode by

MM5 SIMMULATIONS OF SFBA TO SAC/SJV TRANSPORT DURING 30 JULY- 2 AUG 2000 CCOS OZONE EPISODE

by

Tesfamichael B. Ghidey: LBNL, SJSU, DRI


Outline
OUTLINE JULY- 2 AUG 2000 CCOS OZONE EPISODE

  • SYNOPTIC SUMMARY

    • 700 MB

    • SFC

  • MM5 CONFIGURATION

  • WINDS: MESO CONVENTION

    • FULL BARB = 1 M/S

    • FLAG = 5 M/S

  • RESULTS

    • DOMAIN 1: SYNOPTIC WINDS

    • DOMAIN 3: MEOS WINDS:

      LIV, SAC, & SJV SEQUENTIAL OZONE EPISODE DAYS

  • CONCLUSION


  • Nws 700 hpa preview 1200 utc 0500 pdt
    NWS 700 hPa PREVIEW: JULY- 2 AUG 2000 CCOS OZONE EPISODE1200 UTC ( = 0500 PDT)

    Movement of inland-H causes episodes

    • Pre-episode: over Nevada

    • Episode days:

      • moves SW to SJV

      • intensifies

    • Post-episode: dissipates


    Mm5 simmulations of sfba to sac sjv transport during 30 july 2 aug 2000 ccos ozone episode by

    Before ozone episodes: offshore G. C. High; synoptic High in Nevada;

    boundary-Low between Highs; SSW-flow over SFBA

    H

    H



    Nws surface preview 1200 utc or 0500 pdt
    NWS Surface PREVIEW: Nevada; 1200 UTC or 0500 PDT

    Warm-core upper-H projects down to a

    Sfc inverted thermal-L

    • Pre-episode: over Nevada

    • Episode days: moves over SJV & intensifies

    • Post-episode: weakens


    Mm5 simmulations of sfba to sac sjv transport during 30 july 2 aug 2000 ccos ozone episode by

    B/F ozone episodes: warm core “inverted thermal L” from Sea of Cortez to S-Nevada; secondary open-L into northern CA; NW-flow over SFBA & S-flow over SAC

    L

    L


    Mm5 simmulations of sfba to sac sjv transport during 30 july 2 aug 2000 ccos ozone episode by

    LIV episode day: trough moves NW, forms closed low, with N-S axis thru central CA; SE-flow over Sac

    L


    Mm5 configuration
    MM5 configuration axis thru central CA; SE-flow over Sac

    • Version 3.6.0

    • Three domains

      • 36, 12, 4 km

      • 55 x 55, 91 x 91, 190 x 190 grid points

    • 32 sigma levels

      • up to 100 mb

      • first full sigma level at 19 m

    • GDAS IC and BC

    • Analysis nudging only for V and T for

      • 36 km domain

      • above PBL

    • No obs nudging

    • Five layer soil model, Gayno-Seaman PBL

    • Start: 1200 UTC on 28 July and went for 7.5 days

    • LBNL LINUX single processor: 15 days


    Mm5 simmulations of sfba to sac sjv transport during 30 july 2 aug 2000 ccos ozone episode by

    D01 axis thru central CA; SE-flow over Sac

    D03

    D02


    Mm5 simmulations of sfba to sac sjv transport during 30 july 2 aug 2000 ccos ozone episode by

    Validation of 10-m dd axis thru central CA; SE-flow over Sac


    Mm5 domain 1 700 hpa winds preview
    MM5 Domain-1: axis thru central CA; SE-flow over Sac 700 hPa WINDS PREVIEW

    • NWS charts

      • gave only approx p-center locations

      • cannot give flow details in SFBA, Carquinez Straits, & SJV

    • Thus need MM5 to show

      • Pre-episode H: E of SFBA over NEV

      • Episode days: bulge from H extends westward over SFBA

      • Post-episode H: back to E of SFBA over AZ


    Mm5 simmulations of sfba to sac sjv transport during 30 july 2 aug 2000 ccos ozone episode by

    (B/F episodes) MM5 correct: offshore H; H in SE Nev; boundary-L;

    but S-flow over SFBA vs. NWS SW

    L

    H

    H


    Mm5 simmulations of sfba to sac sjv transport during 30 july 2 aug 2000 ccos ozone episode by

    SAC episode day: Syn H to Utah with (now NE-SW) “bulge” (vs. NWS-H over SJV)

    L now S in Cal (vs. NWS: E over CA/AZ border); correct SW flow over SFBA to Sac

    H

    H

    L


    Mm5 domain 1 sfc winds preview at 12 utc 05 pdt
    MM5 Domain-1: SFC WINDS PREVIEW AT 12 UTC (= 05 PDT)

    • Movement to N of thermal L from S-CA sequentially cause episodes

      • Convergence into LIV

      • Increased flow to Sac from SFBA

      • Increased flow into SJV from SFBA

      • Moves offshore

    • Domain-3 Flow details


    Mm5 simmulations of sfba to sac sjv transport during 30 july 2 aug 2000 ccos ozone episode by

    B/F episodes: warm-core thermal-L to S-Nevada & 2 nd CA-L to N (both correct);

    NW-flow over coast & SFBA (correct) and con-flow over SAC (vs NWS S-flow)

    L

    L


    Mm5 simmulations of sfba to sac sjv transport during 30 july 2 aug 2000 ccos ozone episode by

    SAC episode: S-Low moved N & N-Low moved bit S (NWS showed only closed-L as gone); now more W-flow to Sac

    L

    L


    Domain 3 700 hpa preview 2100 utc or 0400 pdt
    DOMAIN-3: 700 hPa PREVIEW (2100 UTC or 0400 PDT) only closed-L as gone); now more W-flow to Sac

    • Offshore-H formation & Fresno-eddy movement cause episodes

    • Initial flow from S does not produce SFBA to Sac transport

    • Syn-H formation directs SFBA flow to Sac & con-current Fresno-eddy blocks SFBA flow into SJV

    • When eddy moves to N

      • SFBA flow into Sac is blocked

      • SFBA flow into SJV is allowed


    Mm5 simmulations of sfba to sac sjv transport during 30 july 2 aug 2000 ccos ozone episode by

    Pre-episode: uniform S-flow only closed-L as gone); now more W-flow to Sac


    Mm5 simmulations of sfba to sac sjv transport during 30 july 2 aug 2000 ccos ozone episode by

    SAC episode: H moved to W at coast (vs bulge from CV to coast in D-1); Fresno eddy N of D-1 position (blocks flow into SJV from SFBA; W flow over SFBA (vs. NWS S-flow) directly to SAC

    H

    L


    Mm5 simmulations of sfba to sac sjv transport during 30 july 2 aug 2000 ccos ozone episode by

    SJV episode: Fresno eddy moved N & H moves inland (both better defined than in D-1);

    flow around eddy blocks SFBA flow to SAC, but forces it S into SJV

    L

    H


    Domain 3 summary of sfc transport to livermore key hours
    DOMAIN-3: SUMMARY OF SFC TRANSPORT TO LIVERMORE (KEY HOURS)

    • Daytime confluence of 3-flows E of LIV (on Mt peak) causes episode

      • Flow from N from Carquinez Straits

      • Flow from W thru GGG

      • Upslope flow on E-side of hills E of LIV

    • For episode need

      • Strong confluence

      • Low speeds

    • Obs first and then MM5


    Mm5 simmulations of sfba to sac sjv transport during 30 july 2 aug 2000 ccos ozone episode by

    Sfc winds-obs at 0700 PST

    (1500 UTC) on 31 July

    (LIV episode morning)

    Note con flow into LIV


    Mm5 simmulations of sfba to sac sjv transport during 30 july 2 aug 2000 ccos ozone episode by

    Sfc wind-obs at 1400 PST

    (2100 UTC) on 31 July

    (LIV episode afternoon)

    Note flow from N into LIV and

    out to E




    Domain 3 sfc transport to sac summary
    DOMAIN 3: SFC TRANSPORT TO SAC SUMMARY of Liv

    • TRANSPORT FROM SFBA BLOCKED BY OPPOSING FLOW ON DAYS BEFORE AND AFTER SAC EPISODE

    • TRANSPORT FROM SFBA NOT BLOCKED ON DAY OF SAC EPISODE




    Domain 3 sfc transport to sjv summary
    DOMAIN 3: SFC TRANSPORT TO SJV SUMMARY not blocked

    • TRANSPORT FROM SFBA TO SJV MUST NOT BE BLOCKED BY OPPOSING FLOWS

    • FLOW INTO SJV MUST

      • NOT BE TOO FAST

      • SHOW CONFLUENCE




    Conclusion
    CONCLUSION not blocked

    • SMALL CHANGES IN 700 hPa-H & SFC-L POSITIONS CAUSED SEQUENTIAL DAILY OZONE MAX IN LIV, SAC, & SJV

    • NWS CHARTS COULD NOT DISCERN DETAILS OF CHANGES, BUT MM5 COULD

    • MM5

      • MATCHED NWS PATTERNS &MESO-OBS REASONABLY WELL

      • PROVIDED ADDITIONAL DETAILS