O. Bernard , A. Sciandra , and S. Rabouille
Large scale precipitation of calcium carbonate in the oceans by coccolithophorids plays an important role in carbon sequestration. However, there is a controversy on the effect of an increase in atmospheric CO2 concentration on both calcification and photosynthesis of coccolithophorids. Indeed recent experiments, performed under nitrogen limitation, revealed that the associated fluxes may be slowed down, while other authors claim the reverse. We designed models to account for various scenarii of calcification and photosynthesis regulation in chemostat cultures of Emiliania huxleyi , based on different hypotheses on the regulation mechanism. These models consider that either carbon dioxide, bicarbonate, carbonate or calcite saturation state (Ω) is the regulating factor. All were calibrated to predict the same carbon fixation rate in nowadays p CO2 , but they turn out to respond differently to an increase in CO2 concentration. Thus, using the four possible models, we simulated a large bloom of Emiliania huxleyi . It results that models assuming a regulation by CO3 2− or Ω predicted much higher carbon fluxes. The response when considering a doubled p CO2 was different and models controlled by CO2 or HCO3 − led to increased carbon fluxes. In addition, the variability between the various scenarii proved to be in the same order of magnitude than the response to p CO2 increase. These sharp discrepancies reveal the consequences of model assumptions on the simulation outcome.
Received: 01 Apr 2009 – Discussion started: 28 May 2009
O. Bernard , A. Sciandra , and S. Rabouille
Status: closed
Status: closed
AC : Author comment | RC : Referee comment | SC : Short comment | EC : Editor comment
- Printer-friendly version
- Supplement
Status: closed
Status: closed
AC : Author comment | RC : Referee comment | SC : Short comment | EC : Editor comment
- Printer-friendly version
- Supplement
O. Bernard , A. Sciandra , and S. Rabouille
O. Bernard , A. Sciandra , and S. Rabouille
Viewed
Total article views: 1,093 (including HTML, PDF, and XML)
HTML
PDF
XML
Total
BibTeX
EndNote
694
339
60
1,093
53
40
HTML: 694
PDF: 339
XML: 60
Total: 1,093
BibTeX: 53
EndNote: 40
Views and downloads (calculated since 01 Feb 2013)
Month
HTML
PDF
XML
Total
Feb 2013
5
10
1
16
Mar 2013
1
9
0
10
Apr 2013
1
10
0
11
May 2013
2
10
0
12
Jun 2013
4
10
0
14
Jul 2013
2
10
0
12
Aug 2013
2
3
0
5
Sep 2013
3
6
1
10
Oct 2013
3
7
1
11
Nov 2013
2
9
0
11
Dec 2013
2
8
1
11
Jan 2014
2
11
2
15
Feb 2014
7
9
5
21
Mar 2014
5
7
2
14
Apr 2014
1
4
2
7
May 2014
6
6
0
12
Jun 2014
2
6
0
8
Jul 2014
2
8
0
10
Aug 2014
4
10
0
14
Sep 2014
1
9
1
11
Oct 2014
1
8
0
9
Nov 2014
2
10
0
12
Dec 2014
5
0
5
Jan 2015
2
8
0
10
Feb 2015
5
4
0
9
Mar 2015
6
2
0
8
Apr 2015
12
0
12
May 2015
3
1
0
4
Jun 2015
6
0
6
Jul 2015
7
0
7
Aug 2015
3
3
0
6
Sep 2015
1
0
1
Oct 2015
5
2
0
7
Nov 2015
6
4
0
10
Dec 2015
2
0
2
Jan 2016
10
4
0
14
Feb 2016
5
1
0
6
Mar 2016
9
3
0
12
Apr 2016
8
4
1
13
May 2016
5
1
0
6
Jun 2016
5
1
0
6
Jul 2016
4
1
5
Aug 2016
3
1
0
4
Sep 2016
2
1
0
3
Oct 2016
4
1
0
5
Nov 2016
4
0
4
Dec 2016
5
1
0
6
Jan 2017
7
1
0
8
Feb 2017
11
1
0
12
Mar 2017
21
2
2
25
Apr 2017
23
2
1
26
May 2017
24
1
1
26
Jun 2017
28
2
3
33
Jul 2017
8
0
8
Aug 2017
0
Sep 2017
4
2
6
Oct 2017
1
3
0
4
Nov 2017
0
Dec 2017
3
1
0
4
Jan 2018
7
1
0
8
Feb 2018
9
0
9
Mar 2018
5
1
0
6
Apr 2018
6
2
4
12
May 2018
5
3
2
10
Jun 2018
2
1
0
3
Jul 2018
3
1
0
4
Aug 2018
5
3
0
8
Sep 2018
3
2
0
5
Oct 2018
6
1
0
7
Nov 2018
6
3
0
9
Dec 2018
2
2
2
6
Jan 2019
12
0
12
Feb 2019
2
1
0
3
Mar 2019
3
3
0
6
Apr 2019
1
0
1
May 2019
2
0
2
Jun 2019
3
0
3
Jul 2019
2
3
0
5
Aug 2019
5
2
0
7
Sep 2019
6
0
6
Oct 2019
2
0
2
Nov 2019
0
Dec 2019
1
0
1
Jan 2020
4
2
0
6
Feb 2020
3
5
0
8
Mar 2020
6
0
6
Apr 2020
3
1
0
4
May 2020
1
1
0
2
Jun 2020
7
0
7
Jul 2020
7
5
12
Aug 2020
2
4
3
9
Sep 2020
3
0
3
Oct 2020
6
3
1
10
Nov 2020
12
3
1
16
Dec 2020
5
1
1
7
Jan 2021
2
5
0
7
Feb 2021
9
3
0
12
Mar 2021
4
0
4
Apr 2021
6
3
0
9
May 2021
1
0
1
Jun 2021
3
2
0
5
Jul 2021
2
0
2
Aug 2021
9
0
9
Sep 2021
2
1
0
3
Oct 2021
7
1
0
8
Nov 2021
7
2
1
10
Dec 2021
10
4
2
16
Jan 2022
5
2
0
7
Feb 2022
5
1
2
8
Mar 2022
5
1
6
Apr 2022
5
2
1
8
May 2022
4
1
0
5
Jun 2022
4
0
4
Jul 2022
5
1
0
6
Aug 2022
6
1
0
7
Sep 2022
5
0
5
Oct 2022
4
1
0
5
Nov 2022
3
1
0
4
Dec 2022
6
1
0
7
Jan 2023
6
0
6
Feb 2023
9
2
1
12
Mar 2023
7
0
7
Apr 2023
3
0
3
May 2023
14
2
0
16
Jun 2023
9
1
1
11
Jul 2023
13
1
0
14
Aug 2023
6
1
0
7
Sep 2023
7
2
1
10
Oct 2023
6
2
1
9
Nov 2023
5
0
5
Dec 2023
5
1
3
9
Jan 2024
4
1
0
5
Feb 2024
12
1
0
13
Mar 2024
3
1
0
4
Cumulative views and downloads
(calculated since 01 Feb 2013)
Month
HTML views
PDF downloads
XML downloads
Feb 2013
5
10
1
Mar 2013
6
19
1
Apr 2013
7
29
1
May 2013
9
39
1
Jun 2013
13
49
1
Jul 2013
15
59
1
Aug 2013
17
62
1
Sep 2013
20
68
2
Oct 2013
23
75
3
Nov 2013
25
84
3
Dec 2013
27
92
4
Jan 2014
29
103
6
Feb 2014
36
112
11
Mar 2014
41
119
13
Apr 2014
42
123
15
May 2014
48
129
15
Jun 2014
50
135
15
Jul 2014
52
143
15
Aug 2014
56
153
15
Sep 2014
57
162
16
Oct 2014
58
170
16
Nov 2014
60
180
16
Dec 2014
60
185
16
Jan 2015
62
193
16
Feb 2015
67
197
16
Mar 2015
73
199
16
Apr 2015
85
199
16
May 2015
88
200
16
Jun 2015
94
200
16
Jul 2015
101
200
16
Aug 2015
104
203
16
Sep 2015
104
204
16
Oct 2015
109
206
16
Nov 2015
115
210
16
Dec 2015
115
212
16
Jan 2016
125
216
16
Feb 2016
130
217
16
Mar 2016
139
220
16
Apr 2016
147
224
17
May 2016
152
225
17
Jun 2016
157
226
17
Jul 2016
161
226
18
Aug 2016
164
227
18
Sep 2016
166
228
18
Oct 2016
170
229
18
Nov 2016
174
229
18
Dec 2016
179
230
18
Jan 2017
186
231
18
Feb 2017
197
232
18
Mar 2017
218
234
20
Apr 2017
241
236
21
May 2017
265
237
22
Jun 2017
293
239
25
Jul 2017
301
239
25
Aug 2017
301
239
25
Sep 2017
305
239
27
Oct 2017
306
242
27
Nov 2017
306
242
27
Dec 2017
309
243
27
Jan 2018
316
244
27
Feb 2018
325
244
27
Mar 2018
330
245
27
Apr 2018
336
247
31
May 2018
341
250
33
Jun 2018
343
251
33
Jul 2018
346
252
33
Aug 2018
351
255
33
Sep 2018
354
257
33
Oct 2018
360
258
33
Nov 2018
366
261
33
Dec 2018
368
263
35
Jan 2019
380
263
35
Feb 2019
382
264
35
Mar 2019
385
267
35
Apr 2019
386
267
35
May 2019
388
267
35
Jun 2019
391
267
35
Jul 2019
393
270
35
Aug 2019
398
272
35
Sep 2019
404
272
35
Oct 2019
406
272
35
Nov 2019
406
272
35
Dec 2019
407
272
35
Jan 2020
411
274
35
Feb 2020
414
279
35
Mar 2020
420
279
35
Apr 2020
423
280
35
May 2020
424
281
35
Jun 2020
431
281
35
Jul 2020
438
281
40
Aug 2020
440
285
43
Sep 2020
443
285
43
Oct 2020
449
288
44
Nov 2020
461
291
45
Dec 2020
466
292
46
Jan 2021
468
297
46
Feb 2021
477
300
46
Mar 2021
481
300
46
Apr 2021
487
303
46
May 2021
488
303
46
Jun 2021
491
305
46
Jul 2021
493
305
46
Aug 2021
502
305
46
Sep 2021
504
306
46
Oct 2021
511
307
46
Nov 2021
518
309
47
Dec 2021
528
313
49
Jan 2022
533
315
49
Feb 2022
538
316
51
Mar 2022
543
316
52
Apr 2022
548
318
53
May 2022
552
319
53
Jun 2022
556
319
53
Jul 2022
561
320
53
Aug 2022
567
321
53
Sep 2022
572
321
53
Oct 2022
576
322
53
Nov 2022
579
323
53
Dec 2022
585
324
53
Jan 2023
591
324
53
Feb 2023
600
326
54
Mar 2023
607
326
54
Apr 2023
610
326
54
May 2023
624
328
54
Jun 2023
633
329
55
Jul 2023
646
330
55
Aug 2023
652
331
55
Sep 2023
659
333
56
Oct 2023
665
335
57
Nov 2023
670
335
57
Dec 2023
675
336
60
Jan 2024
679
337
60
Feb 2024
691
338
60
Mar 2024
694
339
60
Cited
Saved
Latest update: 15 Mar 2024