ML071290298

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ML071290298
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Site:	Pilgrim
Issue date:	04/24/2007
From:	Palla R NRC/NRR/ADES
To:	Natasha Greene NRC/NRR/ADES
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Robert Palla - Paper Abstract Page *I From: Robert Palla To: Natasha Greene Date: 04/24/2007 2:52:54 PM

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Paper Abstract I came across this, as well as some papers (actually just abstracts) by Jen Thorpe and by Samuel Miller.

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Paper Abstract Creation Date 04/24/2007 2:52:54 PM From: Robert Palla Created By: RLP3 @nrc.,oov Recipients Action Date & Time nrc.gov OWGWPO02.HQGWDO01 Delivered 04/24/2007 2:53:00 PM NAG (Natasha Greene) Opened 04/24/2007 2:59:04 PM Post Office Delivered Route OWGWPO02.HQGWDO01 04/24/2007 2:53:00 PM nrc.gov Files Size Date & Time MESSAGE 414 04/24/2007 2:52:54 PM 39276.pdf 542552 04/24/2007 2:50:01 PM Options Auto Delete: No Expiration Date: None Notify Recipients: Yes Priority: Standard ReplyRequested: No Return Notification: None Concealed

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2.3 NUMERICAL STUDY OF THE INFLUENCES ON POLLUTANT TRANSPORT DUE TO MULTIPLE CONVERGENCE ZONES IN THE SEA BREEZES OF CAPE COD AND SOUTHEASTERN MASSACHUSETTS Nelson L. Seaman , Aijun Deng', Glenn K. Hunter', Bruce A. Egan 2 , and Annette M. Gibbs',

1The Pennsylvania State University Department of Meteorology, University Park, PA 2

Egan Environmental, Inc.

Beverly, MA

1. INTRODUCTION nudging to reduce large-scale errors that could affect the local sea-breeze development. NOAA EDAS In New England (NE) it is common for power plants and analyses were used for the model's initial and boundary other large emission sources to be concentrated along conditions and for FDDA. Three 48-h cases with weak the coastline, where prevailing mid-latitude westerly synoptic-scale forcing were chosen from the summer of winds can advect effluents over the ocean. Of course, 2000: 1-2 July, 5-6 July, and 21-22 August. All three mesoscale circulations, especially the sea breeze, can were post cold-frontal cases with weakening large-scale dominate coastal winds when the large-scale flow is winds and a large land-sea thermal contrast that led to weak and land-ocean thermal contrast is large. a sea breeze on one or both days of the episodes.

However, irregular coastlines (bays and peninsulas) and topography lead to multiple thermally driven 3. RESULTS circulations that can interact and make it difficult to estimate exposure to harmful airborne species. Here, we concentrate on results on the 1.33-km grid at Therefore, a numerical investigation has been 1800 UTC, 1 July. Manual analysis shows a thermal conducted to better understand the influences on low over the interior of MA with a converging regional pollutant transport and diffusion due to interactions sea-breeze front (Fig. 2). The MM5 reproduces this between local and mesoscale sea-breezes over Cape front, plus several convergence zones due to local sea Cod and southeast MA. The study involves a breezes over Cape Cod (Fig. 3). Figure 4 shows 6-h mesoscale meteorological model (the PSU/NCAR trajectories initiated from four emissions sources and MM5v3.4), a trajectory calculator (TRAJEC) and three ending at this same time. The trajectories show strong plume dispersion models (CALPUFF, ISC3ST, and influences due- to both the regional and local sea SCIPUFF). Transport and diffusion of plumes from two breezes. Table 1 gives a summary of statistical results power plants (elevated sources), a highway, and Otis for all three cases in three layers of the atmosphere.

AFB (surface sources) were calculated. A companion paper in this volume describes the dispersion modeling 4.

SUMMARY

results (Egan et al. 2002). This paper focuses on the meteorological modeling and trajectory calculations. The MM5 produces realistic mesoscale structures on a 1.33 km grid, in terms of both the regional sea breeze

2. MODEL DESCRIPTION, METHODOLOGY AND and statistical agreement with regional data. The fine-CASE DESCRIPTION grid model also produces local sea breezes over Cape Cod that cannot be resolved by standard observations.

The MM5v3.3 is a 3-D non-hydrostatic full-physics meteorological model with a terrain-following vertical 5. ACKNOWLDGEMENTS coordinate (Grell et al. 1994). For this study, the model was configured with the Dudhia radiation and explicit Support for this study was provided by MA Dept.

moisture schemes, and a 1.5-order TKE turbulence of Public Health through Contract No. RFR File No. 1J2.

scheme. Four nested domains were used with meshes of 36, 12, 4, and 1.33 km (Figure 1). All domains had 6. REFERENCES 50 layers (30 below 1560 m), with the first level at -12 m AGL. The 4-km grid over southern NE had 151 X Egan, B.A., N. Seaman, R. Yamartino, and J. Purdum, 151 points and the 1.33-km grid over Cape Cod had 2002: Modeling pollutant dispersion from elevated 115 X 115 points. The Kain-Fritsch deep convection and ground level sources affected by sea-breeze scheme was used, but only on the 36- and 12-km circulations produced by Cape Cod and its sur-domains. Four-dimensional data assimilation (FDDA) roundings. AMS 12th Joint Conf. on the Appl. Of was applied on the 36- and 12-km domains via analysis Air Poll. Meteor. with A&WMA. Norfolk, VA, 20-24 May, 2 pp.

Corresponding author: N.L. Seaman, Penn State Univ., Grell, G.A., J. Dudhia and D.R. Stauffer, 1994: A Dept. of Meteorology, University Park, PA, 16802. description of the fifth-generation Penn State/NCAR Mesoscale Model (MM5). NCAR Ph.: 814-863-1583, Email: seaman@ems.psu.edu Technical Note NCARITN-398+STR, 121 pp.

S1Gl -0.90 0ARBUk /.. 2000-09-0119,59.55 2N10-07-0I.0I . 1.011E 5900T,-

Figure 1. Location of 36, 12, 4 and 1.33-km nested domains for the MM5 configuration over Cape Cod.

CAPECODI

- DOMAIN 4 (I,33KM)

Figure 3. MM5 surface-layer wind (ms-') on the 1.33-km domain in Case 1 valid at 1800 UTC, 1 July 2000

(+18 h). Full barb is 10 ms>'. Contour interval is 2 ms-1'.

Heavy dashed line with wedges represents sea-breeze front. Dashed lines indicate convergence zones.

CAPECOD00.lO.1.33k0 12-18h

'Tr-j-.t -. r. _I .... d .t 12.0 ho...

Term-hated *t 1.0 hu.r-Figure 2 Manual analysis of sea-level pressure (mb) over the area of the 1.33-km MM5 domain for Case 1 at 1800 UTC, 1 July 2000. Isobar interval is 1 mb.

Table 1. Averaged MM5 statistics for three cases of the Cape Cod sea breeze. MidTrop is 1000-5000 m, PBL is 45-1000 m, SfcLayer is 12 m AGL.

Variable RMS MnAbs Mean  % Within Layer Err Err Err Criteria Speed (ms-') Cr=2.0 ms-_

MidTrop 2.36 2.03 +0.42 60.3 PBL 2.78 2.34 +0.88 49.7 SfcLayer 1.55 1.30 -0.03 78.9 Direct'n (deg) Cr=20.0deq MidTrop 18.8 16.7 -4.3 80.0 PBL 40.9 31.1 -6.7 52.9 Figure 4. Six-hour TRAJEC forward trajectories based SfcLayer 54.8 41.8 -5.7 41.3 Temp. (C) Cr=2.0 (C) on MM5-simulated winds in Case 1. Release time is MidTrop 0.99 0.82 +0.14 93.4 1200 UTC, 1 July 2000 (+12 - 18 h). Parcel 1 is PBL 1.21 1.00 -0.51 88.2 Brayton Point plant. Parcel 2 is Canal plant. Parcel 3 is SfcLayer 2.41 1.97 +0.16 61.2 middle of highway segment. Parcel 4 is Otis AFB. Tick Mix.Rat.(q/kq) Cr=l (q/kq) marks shown on trajectories give positions at 1-h MidTrop 0.97 0.80 -0.13 63.4 intervals, or until the parcels exit the domain.

PBL 1.38 1.16 -0.25 55.2 SfcLayer 2.46 2.46 +0.25 33.3 SLvlPrs (mb) Cr=2.5 mb 0.69 0.62 +0.39 100.0