Climate Change 2001:
Working Group I: The Scientific Basis
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II.2.3: N2O abundances (ppb)

Year A1B A1T A1FI A2 B1 B2 A1p A2p B1p B2p IS92a IS92a/SAR
1970 295 295 295 295 295 295 295 295 295 295 295 295
1980 301 301 301 301 301 301 301 301 301 301 301 301
1990 308 308 308 308 308 308 308 308 308 308 308 308
2000 316 316 316 316 316 316 316 316 316 316 316 319
2010 324 323 325 325 324 323 324 325 324 324 324 328
2020 331 328 335 335 333 328 332 335 333 331 333 339
2030 338 333 347 347 341 333 340 347 341 338 343 350
2040 344 338 361 360 349 338 346 360 350 343 353 361
2050 350 342 378 373 357 342 351 373 358 347 363 371
2060 356 345 396 387 363 346 355 386 366 350 372 382
2070 360 348 413 401 368 350 358 400 373 352 381 391
2080 365 350 429 416 371 354 360 415 380 354 389 400
2090 368 352 445 432 374 358 361 430 385 355 396 409
2100 372 354 460 447 375 362 361 446 389 356 403 417

Note: The IS92a/SAR column refers to values as reported in the SAR using IS92a emissions; whereas the IS92a column is calculated using IS92a emissions but with year 2000 starting values and the new feedbacks on the lifetime. See Chapter 4 for details.

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