Publication Date:
2024-06-25
Description:
Samples for the pigment data set were collected during RV Maria S. Merian cruise MSM9/1 in July/August 2008 in the North Atlantic from Bremen, Germany to St. John's, Newfoundland, Canada (see cruise report Kucera et al. 2014). Sampling was conducted at various stations from a rosette coupled to a conductivity temperature density (CTD) profiler at three to four depths and otherwise sampling regularly every 6 to 8 hours the surface water (approx. 10 m depth) from the ship's moonpool. Water samples were filtered on GF/F filters. Filters were immediately shockfrozen in liquid nitrogen and stored at -80°C until further analysis at the laboratories of the Alfred-Wegener-Institute Helmholtz Centre for Polar and Marine Research (AWI). Measurements of the particulate absorption were carried out on a dual-beam UV/VIS spectrophotometer (Cary 4000, Varian Inc.) equipped with a 150 mm integrating sphere (external DRA-900, Varian, Inc. and Labsphere Inc., made from Spectralon (TM)) using a quantitative filterpad technique modified as follows (see e.g. Simis et al., 2005). The filters were placed in the center of the integrating sphere using a center-mount filter holder perpendicular to the light beam. A wavelength scan from 300 to 850 nm with a resolution of 1 nm (slit width 2 nm, scan rate 150 nm min−1 ) was performed, when the reflectance ports were covered with Spectralon(TM) reflectance standards. The baseline was recorded beforehand with a clean, dry filter, and a filter which was soaked for more than 30 min in purified water served as a reference. The absorption coefficient was calculated from optical density (OD) measurements using a path length amplification factor of 4.5 (β = 1/4.5, Taylor et al. 2011) as a [m−1 ] = −ln (T · A · β/V ), where the transmittance T = exp (−OD), V is the filtrated sample volume in m3 and A the filter clearance area in m2 . Results from the original filter gave particulate absorption, ap. More details on the method can be found in Taylor et al. (2011). The data set is also collocated to Bracher and Taylor (2017) phytoplankton pigment data.
Keywords:
absorption; Absorption coefficient, total particulate matter, at 300 nm; Absorption coefficient, total particulate matter, at 301 nm; Absorption coefficient, total particulate matter, at 302 nm; Absorption coefficient, total particulate matter, at 303 nm; Absorption coefficient, total particulate matter, at 304 nm; Absorption coefficient, total particulate matter, at 305 nm; Absorption coefficient, total particulate matter, at 306 nm; Absorption coefficient, total particulate matter, at 307 nm; Absorption coefficient, total particulate matter, at 308 nm; Absorption coefficient, total particulate matter, at 309 nm; Absorption coefficient, total particulate matter, at 310 nm; Absorption coefficient, total particulate matter, at 311 nm; Absorption coefficient, total particulate matter, at 312 nm; Absorption coefficient, total particulate matter, at 313 nm; Absorption coefficient, total particulate matter, at 314 nm; Absorption coefficient, total particulate matter, at 315 nm; Absorption coefficient, total particulate matter, at 316 nm; Absorption coefficient, total particulate matter, at 317 nm; Absorption coefficient, total particulate matter, at 318 nm; Absorption coefficient, total particulate matter, at 319 nm; Absorption coefficient, total particulate matter, at 320 nm; Absorption coefficient, total particulate matter, at 321 nm; Absorption coefficient, total particulate matter, at 322 nm; Absorption coefficient, total particulate matter, at 323 nm; Absorption coefficient, total particulate matter, at 324 nm; Absorption coefficient, total particulate matter, at 325 nm; Absorption coefficient, total particulate matter, at 326 nm; Absorption coefficient, total particulate matter, at 327 nm; Absorption coefficient, total particulate matter, at 328 nm; Absorption coefficient, total particulate matter, at 329 nm; Absorption coefficient, total particulate matter, at 330 nm; Absorption coefficient, total particulate matter, at 331 nm; Absorption coefficient, total particulate matter, at 332 nm; Absorption coefficient, total particulate matter, at 333 nm; Absorption coefficient, total particulate matter, at 334 nm; Absorption coefficient, total particulate matter, at 335 nm; Absorption coefficient, total particulate matter, at 336 nm; Absorption coefficient, total particulate matter, at 337 nm; Absorption coefficient, total particulate matter, at 338 nm; Absorption coefficient, total particulate matter, at 339 nm; Absorption coefficient, total particulate matter, at 340 nm; Absorption coefficient, total particulate matter, at 341 nm; Absorption coefficient, total particulate matter, at 342 nm; Absorption coefficient, total particulate matter, at 343 nm; Absorption coefficient, total particulate matter, at 344 nm; Absorption coefficient, total particulate matter, at 345 nm; Absorption coefficient, total particulate matter, at 346 nm; Absorption coefficient, total particulate matter, at 347 nm; Absorption coefficient, total particulate matter, at 348 nm; Absorption coefficient, total particulate matter, at 349 nm; Absorption coefficient, total particulate matter, at 350 nm; Absorption coefficient, total particulate matter, at 351 nm; Absorption coefficient, total particulate matter, at 352 nm; Absorption coefficient, total particulate matter, at 353 nm; Absorption coefficient, total particulate matter, at 354 nm; Absorption coefficient, total particulate matter, at 355 nm; Absorption coefficient, total particulate matter, at 356 nm; Absorption coefficient, total particulate matter, at 357 nm; Absorption coefficient, total particulate matter, at 358 nm; Absorption coefficient, total particulate matter, at 359 nm; Absorption coefficient, total particulate matter, at 360 nm; Absorption coefficient, total particulate matter, at 361 nm; Absorption coefficient, total particulate matter, at 362 nm; Absorption coefficient, total particulate matter, at 363 nm; Absorption coefficient, total particulate matter, at 364 nm; Absorption coefficient, total particulate matter, at 365 nm; Absorption coefficient, total particulate matter, at 366 nm; Absorption coefficient, total particulate matter, at 367 nm; Absorption coefficient, total particulate matter, at 368 nm; Absorption coefficient, total particulate matter, at 369 nm; Absorption coefficient, total particulate matter, at 370 nm; Absorption coefficient, total particulate matter, at 371 nm; Absorption coefficient, total particulate matter, at 372 nm; Absorption coefficient, total particulate matter, at 373 nm; Absorption coefficient, total particulate matter, at 374 nm; Absorption coefficient, total particulate matter, at 375 nm; Absorption coefficient, total particulate matter, at 376 nm; Absorption coefficient, total particulate matter, at 377 nm; Absorption coefficient, total particulate matter, at 378 nm; Absorption coefficient, total particulate matter, at 379 nm; Absorption coefficient, total particulate matter, at 380 nm; Absorption coefficient, total particulate matter, at 381 nm; Absorption coefficient, total particulate matter, at 382 nm; Absorption coefficient, total particulate matter, at 383 nm; Absorption coefficient, total particulate matter, at 384 nm; Absorption coefficient, total particulate matter, at 385 nm; Absorption coefficient, total particulate matter, at 386 nm; Absorption coefficient, total particulate matter, at 387 nm; Absorption coefficient, total particulate matter, at 388 nm; Absorption coefficient, total particulate matter, at 389 nm; Absorption coefficient, total particulate matter, at 390 nm; Absorption coefficient, total particulate matter, at 391 nm; Absorption coefficient, total particulate matter, at 392 nm; Absorption coefficient, total particulate matter, at 393 nm; Absorption coefficient, total particulate matter, at 394 nm; Absorption coefficient, total particulate matter, at 395 nm; Absorption coefficient, total particulate matter, at 396 nm; Absorption coefficient, total particulate matter, at 397 nm; Absorption coefficient, total particulate matter, at 398 nm; Absorption coefficient, total particulate matter, at 399 nm; Absorption coefficient, total particulate matter, at 400 nm; Absorption coefficient, total particulate matter, at 401 nm; Absorption coefficient, total particulate matter, at 402 nm; Absorption coefficient, total particulate matter, at 403 nm; Absorption coefficient, total particulate matter, at 404 nm; Absorption coefficient, total particulate matter, at 405 nm; Absorption coefficient, total particulate matter, at 406 nm; Absorption coefficient, total particulate matter, at 407 nm; Absorption coefficient, total particulate matter, at 408 nm; Absorption coefficient, total particulate matter, at 409 nm; Absorption coefficient, total particulate matter, at 410 nm; Absorption coefficient, total particulate matter, at 411 nm; Absorption coefficient, total particulate matter, at 412 nm; Absorption coefficient, total particulate matter, at 413 nm; Absorption coefficient, total particulate matter, at 414 nm; Absorption coefficient, total particulate matter, at 415 nm; Absorption coefficient, total particulate matter, at 416 nm; Absorption coefficient, total particulate matter, at 417 nm; Absorption coefficient, total particulate matter, at 418 nm; Absorption coefficient, total particulate matter, at 419 nm; Absorption coefficient, total particulate matter, at 420 nm; Absorption coefficient, total particulate matter, at 421 nm; Absorption coefficient, total particulate matter, at 422 nm; Absorption coefficient, total particulate matter, at 423 nm; Absorption coefficient, total particulate matter, at 424 nm; Absorption coefficient, total particulate matter, at 425 nm; Absorption coefficient, total particulate matter, at 426 nm; Absorption coefficient, total particulate matter, at 427 nm; Absorption coefficient, total particulate matter, at 428 nm; Absorption coefficient, total particulate matter, at 429 nm; Absorption coefficient, total particulate matter, at 430
Type:
Dataset
Format:
text/tab-separated-values, 28355 data points
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