ACT Cruises -- March 14, 1996 to April 16, 2001

DIC samples have been collected from the following cruises. Some of the
original data and data reduction is located at Esa\'s computer: My
Documents/SOMMA/Lab Studies/ACT.

***Act-2 March 1996 R/V ( Malcolm Baldridge***)

Run during FSLE cruise (4/96) by Steckley, cruise on MB

***ACT-3 July 22, 1996 (Malcolm Baldridge)***

Run by Peltola (5/27/97)

***ACT-4 Dec 4, 1996***

Run by Kenneth Johnson, Brookhaven National Laboratories (4/97)

***ACT-5 March 1997***

Run by Kenneth Johnson, Brookhaven National Laboratories (4/97)

## 

## ACT-6 June 11-21, 1997 (R/V Seward Johnson)

[Objective:]{.underline}

Take samples for DIC, pCO2, and nutrients along the ABACO line and in
the Anegada passage. Underway pCO2 measurement were performed as well

Cruise designation: WIMP 14

Anegada passage cruise: ACT 6

[Location of data:]{.underline}

Computer files:

**Rik-**(Final spreadsheet)Mac7200:

Arriva 1GB/small DIC projects/ABACO&ACT June-97

**Masters (UW files)** Masters / 1997 UW pCO2 data / June 97 Seward
Johnson

**Peltola (raw files)**- Suomi:

C:\\My Documents\\Cruise Reports\\WIMP 14, Ft Pierce to Trinidad, June
97

[Itinerary:]{.underline} Ft. Pierce, Florida, U.S.A. - Port of Spain,
Trinidad

6/11/97 - 6/21/97

[Logistics and sampling:]{.underline}

· June 6th drive to Ft. Pierce to set up

· Depart June 9th - UW pCO2 system not logging lat&long

· June 10th continued assessing problem with logging

\- periodic failures ensued

· Reprogrammed system to accept ship\'s GPS input

· Off Abaco & began sampling DIC, pCO2, and Nutrients

\- pCO2 sampled first:

1\) The 120-mL crimp seal bottles were rinsed twice then filled

2)half filled 3rd time then placed .2ml HgCl

then refilled to top

3)Capped then sealed

4)placed into freezer

\- DIC sampled after:

1\) The 550-mL Pyrex bottles rinsed twice then filled

2)third time .2ml HgCl added to sample

3)apeizon grease added to top

(The remaining sample after DIC analyses was used for TAlk)

\- Nutrients:

1)duplicate samples of each

2)vials rinsed twice then filled

3)capped then placed into freezer

(NOTE, VIALS WERE FILLED TO TOP INSTEAD OF LEAVING HEADSPACE)

· Water bath died, flooded lab with CFCs

\- moved condensing unit into deep freeze and replumbed system to
accommodate

· Skipped sampling off Mayaguana Passage

· Pulled into St. Thomas - FedExed 8 DIC & 4 pCO2 cases

· Sampled Anegada Passage (Stn #22)

· Station 43 had no nutrient samples

· June 23rd entered Port of Spain, Trinidad - disembarked ship

· Shipped remaining pCO2 and DIC samples to Miami via FedEx

· Nutrient samples were held in deep freezer of hotel until departure on

June 25th ,5am.

· Arrived Miami, 12pm and placed Nutrients into lab refrigerator/freezer

(NOTE, NUTRIENTS WERE STORED IN FRIDGE FOR 24-HOURS, SOME SAMPLES
PARTIALLY DETHAWED)

[Shipping:]{.underline}

214 DIC/TAlk Samples

were collected by Jason Masters. Samples from the stations 7-13

and 17 were shipped to Miami. They arrived in Miami 6/20/97. Samples

from the stations 22 and 43 were handcarried and they arrived in Miami.

[Measurements :]{.underline}

The DIC samples were measured 6/25 - 7/16 by Kitack Lee, Esa Peltola,
Richard Wanninkhof and Jason Masters.

The TA:s were measured from the same samples 7/13 -8/27 in Dr. Frank
Millero\'s laboratory by Merredith Galanter and Jim Gartland.

[Data Reduction:]{.underline}

\- Bottle salinities, bottle oxygen and temperature data were obtained
from

Douglas Wilson. Oxygen analyses were performed by Don Cucchiara.
Salinity analyses were performed by Gregg Thomas.

\- Salinity corrections due to offset of the SOMMA salinometer were not
necessary. The agreement between SOMMA and CTD salinity was 0.02 +- 0.02

\- Mercury correction was applied. (multiply all DIC values by 1.00037)

\- CRM (Batch 32) correction was done using a standard, which was run
before

every set of samples: in other words an average value of all the CRM
results was not used. CRM Batch 32 had a given value of 1997.57 +- 1.35.

[Sampling and shipping of pCO2]{.underline}

198 samples were collected by Jason Masters. pCO2 samples were not

collected at the station 43. The samples were stored in coolers keeping

them cool with cool packs. Samples from the stations 7-13 and 17 were

shipped to Miami on 6/15. They arrived in Miami 6/20. Samples of the
station

22 were handcarried and they arrived in Miami.

[Measurements of discrete pCO2 samples use the FID/GC:]{.underline}

The samples were measured 6/24 - 8/7 by Esa Peltola.

Data Reduction:

\- Three closest standards were used for the data reduction.

\- pCO2 values were calculated when ever DIC, TA and nutrient data was

available. (Station 43 was the only station not to have nutrient samples
taken)

\- The effect of an air bubble in a sample bottle (supposedly formed
during

the shipment) was calculated (by Rik Wanninkhof and Esa Peltola) and
noticed to be so

minimal, that volume correction was not applied.

[Nutrient Samples]{.underline}

Sampling and shipping:

396 samples (198 duplicates) were collected by Jason Masters. Nutrient

Samples were not collected at the station 43. The samples were stored in

coolers keeping them frozen with cool packs. Samples from the stations

7-13, 17 and 22 were handcarried and they arrived in Miami\... When the

samples arrived to laboratory they were accidentally placed into a

refrigerator instead of a freezer. The mistake was noticed the next day

and the samples had partly defrosted.

[Measurements of nutrients:]{.underline}

Nutrient samples were measured 7/8-7/11 by Jia-Zhong Zhang.

Only one of each duplicate samples was measured: there is no duplicate
date available.

[Statistics:]{.underline}

\# samples taken #measured #QC 3 or 4 \# broken in shipping or lost in
analyses

DIC 213 200 7 13

pCO2 198 164 37 34

Nuts 396 196 8 2 (only one of each duplicate was measured)

## ACT-7 Feb 1998

DIC's analyzed by Peltola

CRM and HgCl2 corrections have been applied, S correction was not
necessary

## ACT-16 April 2000

1\. Salinity correction was not necessary, since the difference of SOMMA
S and TSG S was less than 0.1

2\. HgCl2 correction was applied

3\. CRM correction of +2.49 was applied

The CRM values were:

Batch# Bottle# Certified Value Measured Value

29 72 1902.33 1899.43

29 346 1902.33 1899.67

29 245 1902.33 1900.41

4\. QC was done using a plot DIC vs. Depth

## ACT-17 June-July 2000

1\. Salinity correction was not necessary, since the difference of SOMMA
S and TSG S was less than 0.1

2\. HgCl2 correction was applied

3\. CRM correction of +1.42 was applied

The CRM values were:

Batch# Bottle# Certified Value Measured Value

29 197 1902.33 1900.71

29 222 1902.33 1902.13

29 440 1902.33 1899.89

4\. QC was done using a plot DIC vs. Depth

# 

# *ACT-18 April 15-16, 2001*

Analyzed by Peltola (May 7-9, 2001)

The Certified CRM batch was #29, DIC=1902.33 umol/kg (S=33.701)

Density correction was applied to samples (2,3,5,11,18,19,21,23,24),

HgCl2 correction was applied to all samples

A CRM correction of 1.68 was applied to samples 1-8;

measured c(CRM#37)=1900.65 umol/kg

A CRM correction of -1.70 was applied to samples 9-16;

measured c(CRM)=1904.03 umol/kg

A CRM correction of 2.11 was applied to samples 17-24;

measured c(CRM#553)=1900.22 umol/kg