BAS Ozone Bulletin 07/98 issued 1999 May 13
The 1998 Antarctic ozone hole was broadly similar to those seen in recent years, although a little larger and a little longer lasting. At Halley the final spring warming did not take place until late December and a remnant of the ozone hole passed over the station in late January.
The first bulletin of the 1999/2000 season will be issued in late August.
1. Data from the British Antarctic Survey (BAS) Halley station (76-deg south, 26-deg west, on the Brunt ice shelf).
Halley preliminary mean daily total ozone, (DU)
Dobson No 103: Instrument constants revised 1998 November 13.
(0 indicates no data)
1998 August 1 - 1999 April 30
158 157 165 141 148 188 199 174 145 122
126 142 146 117 119 110 105 143 136 125
119 112 124 109 111 111 109 118 125 130
127 121 119 117 127 142 143 150 149 145
134 129 129 136 139 162 219 183 183 211 212
209 213 173 187 189 166 157 154 138 147
152 177 204 192 192 182 195 177 199 210
238 239 200 177 171 172 182 172 165 175
177 228 271 248 226 211 198 190 210 230
225 261 251 247 240 237 263 269 277 260
280 294 299 300 296 296 298 290 276 268 285
289 285 277 284 289 285 291 269 275 278
263 272 299 260 256 260 260 262 278 241
237 248 264 290 270 258 257 270 284 296 272
268 255 281 259 252 248 253 265 269 256
257 266 270 272 269 260 252 248 251 252
263 271 265 245 259 260 234 257
256 246 235 246 242 242 248 241 238 242
261 258 265 260 256 264 267 283 277 294
262 208 219 256 236 250 238 265 275 272 282
253 256 243 247 237 266 280 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
2. Data from the British Antarctic Survey (BAS) Rothera station (68-deg south, 68-deg west on Adelaide Island).
Rothera preliminary mean daily total ozone, (DU)
(0 indicates no data or data not available)
1998 July 1 - 1999 April 30
241 277 293 308 294 281 294 307 299 282
285 297 276 290 298 282 278 280 0 0 289
284 274 282 213 221 246 305 312 261 236
264 248 233 211 247 241 240 269 259 232
0 0 204 184 190 201 237 208 229 204 202
222 210 202 183 206 189 175 188 172 154
165 151 166 142 118 105 105 0 134 122
152 162 138 142 150 127 181 204 128 115
107 115 131 146 140 162 182 152 123 126
121 0 0 167 168 146 134 118 111 102
102 114 151 251 258 268 245 233 244 252 239
231 236 0 271 250 168 170 198 186 180
268 319 334 332 264 226 225 217 318 317
330 297 234 203 244 264 252 246 256 274
244 159 165 172 176 176 195 209 0 295
292 303 302 271 241 256 282 304 312 320
320 313 305 296 288 282 273 291 304 290 278
0 272 273 263 264 269 270 276 283 268
278 280 287 284 269 259 258 255 258 273
278 273 288 280 277 280 275 257 254 249 250
258 270 278 273 278 273 275 0 0 0
264 271 277 264 276 281 284 293 279 277
279 290 309 301 0 284 298 264
270 259 254 257 260 265 276 284 294 274
281 291 282 284 294 289 284 273 0 267
277 250 226 242 243 246 241 252 257 265 263
249 258 265 271 262 287 296 303 304 323
303 301 328 0 0 262 256 264 295 305
305 248 260 262 257 228 258 269 278 263
3. Data from the Ukrainian Antarctic Research Centre Vernadsky station (65-deg south, 64-deg west on the coast of the Antarctic Peninsula, formerly the BAS Faraday station).
Vernadsky preliminary mean daily total ozone (DU).
Dobson No 31: Instrument constants revised 1999 May 10
1998 August 1 - 1999 April 30
272 265 281 249 220 253 288 295 270 237
234 233 226 212 224 251 220 259 251 244
231 201 229 197 199 208 266 225 262 243 211
253 240 261 212 222 198 185 201 187 188
197 184 201 182 146 132 156 149 240 164
186 293 213 236 221 167 214 240 188 155
139 158 149 178 180 196 249 258 161 163
151 177 207 245 246 212 229 167 156 132
136 136 162 257 298 317 344 333 339 351 338
315 309 302 341 324 238 221 255 250 185
289 365 342 358 315 289 297 298 350 338
363 383 275 260 307 308 317 308 320 330
297 244 197 188 215 197 197 224 280 310
325 317 317 296 266 263 302 300 322 317
325 308 311 293 297 276 289 289 298 280 286
284 300 288 277 287 302 309 309 310 267
296 292 294 304 287 281 277 279 279 275
275 273 287 297 290 289 297 277 285 274 272
276 279 295 290 288 286 285 285 288 279
281 279 280 280 299 275 292 297 288 302
292 281 316 310 312 276 306 278
250 265 260 274 267 269 267 273 304 269
279 287 285 289 291 297 307 284 290 290
286 274 238 232 249 264 239 246 256 292 283
242 240 261 278 262 292 301 298 301 319
327 307 342 313 278 272 271 266 307 261
303 258 251 271 263 233 255 270 272 251
4. Information from other sources.
TOVS satellite images from the US NCEP/NWS/NOAA Climate Prediction Center and EP/TOMS images from the US NASA/GSFC show the formation and decline of the ozone hole. The edge of the ozone hole crossed over the tip of South America around September 7, 18, October 1, 11, November 10 and December 4. The area was more severely affected from October 19 to 23 and December 7 to 11, on the later occasion significant ozone depletion reaching as far as 40 South. The hole covered an area of around 27 million square kilometres at its largest, which is larger than in recent years.
Further information is available on the BAS ozone web page, which contains earlier bulletins, data, graphs and general ozone information. The url is:
http://www.nbs.ac.uk/public/icd/jds/ozone
Note that all ozone values in this bulletin are preliminary and are subject to revision from time to time when the instrument constants are re-evaluated. Final data will be archived with WOUDC, Toronto in due course, but preliminary data back to 1973 are available from BAS on request. All Dobson ozone data is reduced to the Bass-Paur scale as recommended by the WMO. If you use or pass on this data please make acknowledgement to J D Shanklin, British Antarctic Survey.
Jon Shanklin