GO-SHIP P02E 2022 Hydrographic Program

Summary

The 2022 reoccupation of leg 2 of the GO-SHIP P02 hydrographic line, RR2205 (Fig. 1), included 130 profiles collected on 89 stations using a 36-bottle rosette. This includes a shallow test dip carried out on the way to the first station of the section, reoccupation of 10 stations in the California Current region near the eastern end of the section, as well as 1000-m casts for the BIO-GO-SHIP 1 program collected on every third station. Additionally, four GO_BGC floats with biochemical sensors were deployed. All floats were deployed on stations with bio profiles, using an extended bottle sampling schedule. Most of the P2 section, including the entire zonal component along 30N, was collected with the target 30nm station spacing. For the 2022 occupation it was decided to follow mostly the original cross-slope/-shelf approach to the Californian coast from the 1993 WOCE cruises, which coincides with the southernmost repeat section of the CalCOFI program. One of the stations had to be moved slightly because of Navy operations in the area. Stations along this approach were spaced less than 30nm apart, with particularly close spacing over the steep continental slope. The rosette instruments included a pumped CTD with dual temperature and conductivity lines, one with oxygen (SBE43), a secondary separate RINKO oxygen sensor, fluorometer, transmissometer, upward and downward-looking LADCPs, an underwater vision profiler (UVP), two upward-looking and one downward-looking Chi-POD. Niskin bottle samples were collected and analyzed for the standard GO-SHIP set of parameters. Along all transits continuous underway shipboard multibeam bathymetry, TSG, met and pCO2 data were collected and a flow-through cytometer was run. The SADCP ran continuously. The EK-80 ran during each cast. There was also discrete underway sampling three times a day that included HPLC, POM, POC/N and DNA/RNA. See individual sections for further detail.

Red rings: Bio stations. Green: stations of the partial re-occupation of the CCS with two full profiles (bio stations also have 2 bio profiles).

In spite of the failure of the primary winch after the first deep profile there were no significant delays due to technical problems. Therefore, and also because of the perfect weather and sea state prevailing during the cruise, the full science plan could be carried out, including an optional partial second crossing of the California Current system. Preliminary results include observations of strong climate-change trends in the abyssal temperatures and salinities in the subtropical gyre since the previous occupation of P02 in 2013, as well as the mapping of a large plume of SF6 in the eastern part of the section, that is likely caused by the propulsion system of a particular type of Navy torpedoes.

Programs and Principal Investigators

Program	Affiliation	Principal Investigator	Email
BGC Floats	SIO	Lynne Talley	ltalley@ucsd.edu
C13 & C14	UW, WHOI	Rolf Sonnerup, Roberta Hansman	rolf@uw.edu, rhansman@whoi.edu
CFCs, SF6	UT	Dong-Ha Min	dongha@austin.utexas.edu
Chipods	OSU	Jonathan Nash	nash@coas.oregonstate.edu
CTDO Data, Salinity, Nutrients, Dissolved O2	UCSD, SIO	Susan Becker, Todd Martz	sbecker@ucsd.edu, trmartz@ucsd.edu
Underway pCO2	PMEL, NOAA	Simone Alin	simone.r.alin@noaa.gov
DOC, TDN	UCSB	Craig Carlson	craig_carlson@ucsb.edu
Lowered ADCP	LDEO	Andreas Thurnherr	ant@ldeo.columbia.edu
POC, HPLC	UCSD	Adam Martiny	amartiny@uci.edu
Shipboard ADCP	UH	Julia Hummon	hummon@hawaii.edu
Total Alkalinity, pH	SIO	Andrew Dickson	adickson@ucsd.edu
Total CO2 (DIC)	PMEL, NOAA	Richard Feely	richard.a.feely@noaa.gov
Transmissometer	UCI, OSU	Adam Martiny, Jason Graff	amartiny@uci.edu, jason.graff@oregonstate.edu
UVP-5	UAF	Andrew McDonnell	amcdonnell@alaska.edu
Viral Abundance	UoE	Ben Temperton	b.temperton@exeter.ac.uk

Science Team and Responsibilities

Duty	Name	Affiliation	Email Address
Chief Scientist	Andreas Thurnherr	LDEO	ant@ldeo.columbia.edu
Co-Chief Scientist	Sebastien Bigorre	WHOI	sbigorre@whoi.edu
CTD Watchstander	Bailey Amos	TAMU	barmos@tamu.edu
CTD Watchstander	Turner Johnson	UCSD	turner.e.johnson@gmail.com
CTD Watchstander	Alyssa Schultz	TAMU	aschultz@tamu.edu
CTD Watchstander	Dylan Shafer	UCSD	dshafer@ucsd.edu
Nutrients	John Ballard	UCSD ODF	jrballard@ucsd.edu
Nutrients	Tania Leung	UCSD ODF	taleung@ucsd.edu
CTDO Processing, Database Management	Michael Kovatch	UCSD ODF	mkovatch@ucsd.edu
Salts, Marine Technician	Gabriel Matthias	TAMU	EscaMTS@gmail.com
Salts	Laurette Roy	TAMU	laurette.m.roy@gmail.com
Marine Technician	Mason Schettig	UCSD	mschettig@ucsd.edu
CR Technician	Howell Johnson	UCSD	hkjohnson@ucsd.edu
CR Technician	Maya Thompson	UCSD	m6thompson@ucsd.edu
Dissolved O2	Elisa Aitoro	UCSD ODF	eaitoro@ucsd.edu
Dissolved O2	Robert “Ben” Freiberger	UCSD ODF	rfreiberger@ucsd.edu
LADCP	Lilian Dove	Caltech	dove@caltech.edu
Bio/Imaging	Skylar Gerace	UCI	sgerace@uci.edu
Bio/Genomics	Sydney Lewis	UH	sydneyl7@hawaii.edu
Total Alkalinity	Daniela Nestory	UCSD	dnestory@ucsd.edu
Total Alkalinity	Sidney Wayne	UCSD	sidneyelisawayne@gmail.com
pH	Brison Grey	U Miami	bjg136@miami.edu
pH	Albert Ortiz	RSMAS	albert.ortiz@rsmas.miami.edu
DIC	Andrew Collins	NOAA	djgreel1@gmail.com
DIC	Charles Featherstone	NOAA	charles.featherstone@noaa.gov
CFCs	David Cooper	UT	davidcooper59@gmail.com
CFCs	Carol Gonzalez	UT	carolgonzalez@utexas.edu
CFCs	Matthew Varas	TAMU	mvaras@tamu.edu
DOC	Michelle Michelsen	UOE	a.tinari@umiami.edu

1

Throughout “core” refers to the regular (GO-SHIP levels 1-2) sampling and “bio” refers to the biology sampling performed by the Bio GO-SHIP team. See Bio section of this report for the details on the bio sampling.