2017-2018 USAP Field Season
Climate variability and predictability (CLIVAR)
Dr. James Howard Swift
University of California San Diego
Project Web Site:
Supporting Stations: RV/IB Nathaniel B. Palmer
The program is in support of CLIVAR and the Carbon Science Programs, and is a component of a global observing system for the physical climate/CO2 system. By integrating the scientific needs of the carbon and hydrography/tracer communities, we contribute to the following overlapping scientific objectives: Data for Model Calibration, Validation and Model Based Synthesis; Carbon System Studies; Heat and Freshwater Storage and Flux Studies; Deep and Shallow Water Mass and Ventilation Studies; and Calibration of Autonomous Sensors. A joint study of the ocean carbon cycle and circulation is helping to identify critical areas where potential changes in ocean circulation could have serious consequences for future anthropogenic uptake. Global warming-induced changes in the ocean’s transport of heat and freshwater, which could affect the circulation, are being followed through these long-term measurements.
Field Season Overview
This is for the P06 track line. There are two legs for this cruise. This NBP17-06 SIP is to capture leg 1 (Sydney to Papeete). The NBP17-07 SIP will capture leg 2 (Papeete to Valparaiso). [Noted added ?: As far as is known to JHS, there is only one SIP for the two legs. Certainly JHS has worked on only one SIP form.]
The sampling on each cruise consists of boundary-to-boundary sections of full-depth stations at nominal 30 nautical mile spacing in basin interiors (closer at boundaries and over bathymetric features) with one deployment per station of a grantee-provided CTDO/rosette system with 36 10-liter bottles and Lowered Acoustic Doppler Current Profiler (LADCP). Additional sensors and instruments may be part of the CTD system, such as transmissometer, fluorometer, and chipod microstructure profiler (P06 and S04P) and UVP video plankton recorder (S04P only). Each station will take about four and a half hours and approximately three hours transit between each station. [Station time estimate includes coming on to station. For stations with bottom depths 4000-1000 meters, one hour in-water time per 1000 meters water depth is a generous allowance. For stations with bottom depths less than 1000 meters, in-water time is typically 45-60 minutes .] The ship’s standard underway systems including meteorology, surface seawater T/S/O2/pCO2, centerline depth to bottom, navigation, hull-mounted ADCP, etc. are also required.
On Leg 2 there will be a NASA peristaltic pump and a hose deployed over the side while on station. On Leg 2, when weather, conditions, and the chief scientist permit, there will be a once-daily 30-minute NASA optical cast to ca. 200 meters within 2 hours of local noon..
P06 is the GO-SHIP line across the South Pacific that will depart from Sydney, Australia after a four day port call for mobilization and end in Valparaiso, Chile with a two day port call for demobilization. The cruise will be conducted in two legs with a three day port call between in Papeete, Tahiti. The number of stations for this cruise is nominally 284 but will be adjusted accordingly to fit within the allocated days at sea. Each station will consist of a full-depth CTD rosette cast. The Chief Scientist will work with the MPC and Captain to adjust the station spacing and number to accommodate any setbacks due to weather and high seas. The lead PI has indicated this can be done while still accomplishing the scientific goals of the cruise.
Leg 1 includes two deployments of Pressure Inverted Echo Sounders (PIES). Legs 1 and 2 include deployment of Argo and Argo?SOCCOM floats.
During the port call, the science and ASC teams will turnover personnel. It is currently known that the NASA Ocean Biology/Biogeochemistry team will join for Leg 2. The ship will also be refueled at this time.
The following sampling programs are anticipated for the P06 cruises but are subject to change (sampling programs denoted with an asterisk (*) are not yet confirmed by JHS as of 12DEC2016): • CTDO • Salinity • Oxygen (O2) • Nutrients • CFC/SF6 • Dissolved Inorganic Carbon (DIC) • Total Alkalinity (TAlk) • pH • *Helium (He) [not yet confirmed by JHS as of 12DEC2016] • *Tritium (Tr) [not yet confirmed by JHS as of 12DEC2016] • Shipboard ADCP • Lowered ADCP • Underway (UW) Temperature and Salinity (TS) • UW pCO2 • UW Navigation Bathymetry • UW Meteorological (Met) data • Carbon-14 (C14) • Carbon-13 (C13) • Transmissometer (on CTD) • Fluorometer (on CTD) • chipod microstructure profiler (on CTD frame) • Del 15N of NO3 (Nitrate) • 17O of O2 • High Performance Liquid Chromatography (HPLC) pigments, Leg 2 [Leg 1 not yet confirmed as of 12DEC2016] • Dissolved Organic Carbon (DOC)/ Total Dissolved Nitrogen (TDN) • Optical profilers- NASA program, Leg 2 • Profiling radiometer and above water radiometer – NASA program, Leg 2 • Particulate Organic Carbon (POC) – NASA program, Leg 2 • Colored Dissolved Organic Matter (CDOM) – NASA program, Leg 2 • Dissolved Organic Carbon (DOC)/ Total Dissolved Nitrogen (TDN) – NASA program, Leg 2 • plankton community compositiion (FlowCAM) - NASA program, Leg 2 • Argo Floats • SOCCOM/Argo floats • Pressure Inverted Echo Sounder deployments (2 on Leg 1 only) • *Additional water sampling programs are likely to be added before cruise (collection only)
NOTE: This group has previously worked with the USAP as CLIVAR. The support outlined is comparable to that of previous cruises on NBP14-03 and NBP11-02.
Deploying Team Members