MONTBLEX data archival centre

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1 Prc. Indian Acad. Sci. (Earth Planet. Sci.), Vl. 14, N. 2, June 1995, pp Printed in India. MONTBLEX data archival centre K G VERNEKAR and S S ARAL1KATTI Indian Institute f Trpical Meterlgy, Pune 411 8, India Abstract. A c-rdinated prject Mnsn Trugh Bundary Layer Experiment (MON- TBLEX) t study the atmspheric bundary layer in the mnsn trugh regin was taken up during m high instrumented twers were erected at Kharagpur, Banaras, Delhi and Jdhpur. Sphisticated equipment like Dppler sdar and Kytn were used at Kharagpur. Sdars were expsed at Calcutta, Delhi and Jdhpur. ORV Sagarkanya cruises were arranged in the Bay f Bengal. The India Meterlgical Department set up new surface and radiatin bservatries and released special radi-snde, pilt ballns. Using the abve mentined platfrms, data were cllected during April- September 199 and after prper editing the entire data were archived at the Indian Institute f Trpical Meterlgy, Pune. The DST-MONTBLEX data bank was started at IITM n 25th Nvember The paper cntains the details f this data. Keywrds. Data centre; MONTBLEX data; bundary layer data. 1. Intrductin The main aim f the c-rdinated prject n Mnsn Trugh Bundary Layer Experiment was t study the land-lcked mnsn trugh dynamics. The cre measurements included the evaluatin f surface fluxes at Kharagpur, Varanasi, New Delhi and Jdhpur using twer-based data. The large scale atmspheric parameters in the mnsn trugh regin were mnitred by the India Meterlgical Department and Indian Air Frce. The ship bservatins near the head f the Bay f Bengal, a ptential site fr develpment f mnsn depressins, were arranged by the Natinal Institute f Oceangraphy. Details f the bservatinal prgramme can be seen in figure Special bservatins 2.1 Dppler sdar mnstatic sdar bservatins A Dppler sdar was perated by the Indian Institute f Trpical Meterlgy, Pune at Kharagpur during April 28th - Sept. 15th, 199. Mnthwise number f bservatins are as fllws. I Mnth May June July~Aug. Sep~-~ Duratin I in hurs / / 249

2 25 K G Vernekar and S S Aralikatti Frequency f bservatins f Dppler sdar is as fllws. Hurs ~ per day Number f days Mnstatic sdars, ne each at Calcutta, Banaras, Delhi, Jdhpur, were perated during the MONTBLEX perid. 2.2 K ytn bservatins A 2"3 m 3 Kytn was perated by the Indian Institute f Trpical Meterlgy, Pune n 28 ccasins. Thugh the Kytn has the capability t reach 15 m, the maximum height reached during the curse f experimental phase was nly 84 m. This cnstraint was due t high winds prevailing at Kharagpur. 2.3 Minisnde bservatins Slw-rising minisndes were released by the Indian Institute f Trpical Meterlgy t recrd temperature fluctuatins in the bundary layer. During IOP abut 7-8 minisndes were released per day. A ttal f 45 minisndes were released. 2.4 Marine bundary layer bservatins The Natinal Institute f Oceangraphy, perated its research vessel Sagarkanya during the mnths f Aug. - Sept. 199 ver Bay f Bengal. The ship was statined at a fixed pint 2~176 fr ver fifteen days and rutine marine bservatins were cllected alng with micrmeterlgical bservatins arranged by IITM, Pune. The rutes f Sagarkanya are shwn in figure Data archival prgramme After successful cmpletin f the Mnsn Trugh Bundary Layer Experiment, it was decided that the vast data cllected during the main campaign shuld be archived at ne place, and accrdingly the Department f Science and Technlgy sanctined the prpsal n archival f MONTBLEX data at the Indian Institute f Trpical Meterlgy, Pune. All the prject leaders wh actively participated in the experiment were required t transfer their data t the data bank. The data bank became fully peratinal during February Data disseminatin The data frm instrumented twers are stred n cartridge tapes. Mst f the remaining data are stred n flppies (1.2 MB, DSHD). A small amunt f data is held in

3 MON TBLEX data archival centre 251,, I c rr b.i ci_._i z I-- > s w rn x I,I._J rn I-- Z - _ z cr ~ _ O~ r ~ ~ ill Z -~ ~,~ :_ks z (j %\ <~ (n Z ~ ll- N- '~,~ ~.. GO ~" ~ r'~o r ~1~_ r ~ m rr z~ rr LU --(m Z---~-- > A. -- ~ ~ ~'_~ ~ ~. -.-~., ~ ~ ~ _1 '~ "" k ~ ~" ) X #-- ~.._- Is" :3 u / L / ~= -- ~- (~[ ~. i_.j -I '-- -- ~ ~ (.~ '~ ;~,.~ O -- '~ t~.,~ ~ ~ I-- ~ ~ ~.J 1 u') t~ t~ Olr > t ~ tr~

4 252 K G Vernekar and S S Aralikatti ~n qn (.'~ ~rl I I I I' I I I I I f k e., ml ~J r ~Z l:l [,. e~ X r e,, i:~ ~ ~ ~r'-. x u.l..i, [,-- Z i-,,,'~ I!.l I I I ~ 1 1 I I I.-T jl I l I! I l ;e L~

5 MONTBLEX data archival centre 253 manuscript frm nly. Research scientists interested in availing the MONTBLEX data can btain them by supplying the apprpriate magnetic media. Tw wrkshps n the results f the MONTBLEX experiment were held; first at IISc, Bangalre during 16th-17th January 1992 and the secnd at IITM, Pune during 16th-17th March MONTBLEX data has been supplied t the fllwing rganizatins: DST New Delhi, IITM Pune, IMD Pune, IISc Bangalre, BARC Bmbay, NPOL Cchin, JNU New Delhi, ISI Calcutta, NCMRWF New Delhi, BHU Banaras, IAF New Delhi, lit New Delhi and Jadhavpur University. Calcutta. 3.2 The bulk is frm instrumented twers. The entire slw and fast data are held n 65 cartridges f 4 MB each. The details f this data can be btained frm the authrs. The details f ther data archived at Data Centre are as fllws. Dppler sdar data 5) Statin : K G Vernekar, IITM, Pune. : Dppler sdar data. : Wind cmpnents (u, v, w) at 3m interval up t 15 m. Reliability assessment fr wind cmpnents. : 15th May- 8th Sept : Kharagpur. The entire data are available n 7 flppies f 1.2 MB capacity. Data cntain infrmatin n all the three cmpnents f winds up t 15 m at an interval f 3 m Standard deviatin f all the three cmpnents is als available. The data reliability fr each cmpnent f wind is specified. Mnstatic sdar d~ta : S P Singal, NPL, New Delhi. : Mnstaticsdar data. : Inversin height, types f inversins and thermals. : 3th May - 3th Aug ) Statin : Jdhpur. The quantized data are available n ne (36 KB) flppy. The fascimile recrds are available n 1 pages. IITM - Sagarkanya data : K G Vernekar, IITM, Pune. : Ship twer data. : Wind speed, temperature, at tw levels

6 254 K G Vernekar and S S Aralikatti : and sea surface temperature (SST). : llth Aug.- 22nd Sept ) Statins : 48 statins in Bay f Bengal. The data are available n 13 flppies (36 KB each) fr wind speeds and temperatures at tw levels (bw level and!.65 m abve). Reliability is pr. 5) Statin Kytn data : K G Vernekar, IITM, Pune. : Kytn data. : Wind speed, directin, dry bulb temperature, wet bulb temperature and mixing rati prfiles. : 22nd May- 28th June 199. : Kharagpur. In all, 26 kytn flights were cnducted at Kharagpur. The data cntain prfiles f dry bulb temperature, wet bulb temperature, wind speed, wind directin, relative humidity and mixing rati. The printed data are available n 1 pages (12 clumns, 6 lines/page). 5) Statin Minisnde data : K G Vernekar, IITM, Pune. : Minisnde data. : Temperature prfile data. : 26th May- 12th July 199. : Kharagpur. The data cntain prfiles f 46 minisnde flights. Fur t six sndes were released per day during lop perids. As there was n height sensr, a cnstant ascent rate was assumed during day time. The printed data are available n 21 pages. 5) Statin NIO - Sagarkanya data Panakkala Ra, NIO, Ga. Oceanic data and surface data. Cnductivity, salinity, surface meterlgical data, SST data and upper air data. 1 lth Aug. - 22nd Sept Over Bay f Bengal.

7 MONTBLEX data archival centre 255 1) Cnductivity, temperature and depth (CTD) up t 1m. 2) Salinity, temperature and depth (STD) up t 3 m. 3) Surface meterlgical bservatins. 4) Upper air bservatin at synptic hurs in August 199. The data are available n 2 flppies (36 KB each). 5) Statins Twer data : A Prabhu, IISc, Bangalre. : 3 m. twer data at 6 levels : Twer data at 1, 2, 4, 8, 15, and 3 m levels. : Mid May- mid Sept : Kharagpur, Varanasi, Jdhpur and Delhi. Twer data at 1, 2, 4, 8, 15 and 3 m n wind speed, wind directin, dry temperature (slw respnse), dry temperature (rapid respnse), wet bulb temperature are recrded. Data frm Gill prpeller, sil temperature at 1, 2, 6 cm belw the surface and snic anemmeter (at 8 m at Kharagpur, 4 m at Jdhpur and Varanasi) are als recrded. The twer data fr Kharagpur, Varanasi, Jdhpur and Delhi statins are available n 65 cartridges (4 MB capacity). RS/RW lw level, pilt balln and surface data (IMD) 3) Descriptin 5) Statins : S K Srivastava, IMD, New Delhi. : Surface data. : All elements cvered under surface data. : 25th May- 15th Sept : Statins cvered under MONTBLEX area. Calcutta Bhubaneshwar Ranchi Delhi Jdhpur Ttal bservatins Rutine Lw level sndes Pilt balln data fr Gaya, Jamshedpur, Raipur, Bhubaneshwar, Gpalpur, Jharsuguda, Balasre and Panagarh alng with surface data are available. This data frm India Meterlgical Department are available in 7 bund vlumes and als available n 1 flppy (1.2 MB). 2) Brief descriptin Indian Air Frce data : N. Natarajan. : Air-brnemeterlgicalparametres and surface bse~'vatins.

8 256 K G Vernekar and S S Aralikatti 3) Perid 4) Statins 1st May- 15th Sept Bhatinda, Kalaikunda, Gwalir, Bareilly, Hindn, Bmbrauli, Agra, Lucknw, Jdhpur, Grakhpur, Suratgarh and Kanpur. The fllwing data are available: 1) The take-fftime, 2) time f bservatins, 3) statin c-rdinates, 4) height abve mean sea level, 5) wind speed and directin, 6) temperature, 7) clud bservatins. Pilt balln bservatins and surface bservatins fr a few statins are als available. The data are recrded n 5 flppies (1"2 MB). Mnstatic sdar data : J Das. 2) Type f data : Mnstatic sdar data. : Inversin heights, types f inversins and thermals. : 28th May- 3rd Sept ) Statin : Varanasi. The cmplete quantized data are n 5 typed pages.

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