VERTIGO project Niskin bottle sample data from KM0414 and RR_K2 cruises
Siegel, David A.
MetadataShow full item record
LocationHawaii Ocean Time-series (HOT) site
KM0414: westlimit -159.08; southlimit 22.08; eastlimit -156.92; northlimit 23.75
Subarctic Northwest Pacific
RR_K2: westlimit 158.680; southlimit 46.099; eastlimit 162.057; northlimit 47.901
The main goal of VERTIGO is the investigation of the mechanisms that control the efficiency of particle transport through the mesopelagic portion of the water column. Question: What controls the efficiency of particle transport between the surface and deep ocean? More specifically, what is the fate of sinking particles leaving the upper ocean and what factors influence remineralization length scales for different sinking particle classes? VERTIGO researchers have set out to test two basic hypotheses regarding remineralization control, namely: 1. particle source characteristics are the dominant control on the efficiency of particle transport; and/or that 2. mid-water processing, either by zooplankton or bacteria, controls transport efficiency. To test their hypotheses, they will conduct process studies in the field focused on particle flux and composition changes in the upper 500-1000m of the ocean. The basic approach is to examine changes in particle composition and flux with depth within a given source region using a combination of approaches, many of which are new to the field. These include neutrally buoyant sediment traps, particle pumps, settling columns and respiration chambers, along with the development of new biological and geochemical tools for an integrated biogeochemical assessment of the biological pump. Three week process study cruises have been planned at two sites - the Hawaii Ocean Time-series site (HOT) and a new moored time-series site in the subarctic NW Pacific (Japanese site K2; 47°N 160°E) - where there are strong contrasts in rates of production, export, particle composition and expected remineralization length scales. Evidence for variability in the flux vs. depth relationship of sinking particles is not in dispute but the controls on particle transport efficiency through the twilight zone remain poorly understood. A lack of reliable flux and particle characterization data within the twilight zone has hampered our ability to make progress in this area, and no single approach is likely to resolve these issues. The proposed study will apply quantitative modeling to determine the net effects of the individual particle processes on the effective transport of carbon and other elements, and to place the shipboard observations in the context of spatial and temporal variations in these processes. For rapid progress in this area, we have organized this effort as a group proposal taking advantage of expertise in the US and international community. The efficiency of particle transport is important for an accurate assessment of the ocean C sink. Globally, the magnitude and efficiency of the biological pump will in part modulate levels of atmospheric CO2. We maintain that to understand present day ocean C sequestration and to evaluate potential strategies for enhancing sequestration, we need to assess possible changes in the efficiency of particle transport due to climate variability or via purposeful manipulations of C uptake, such as via iron fertilization.
VERTIGO project Niskin bottle sample data from KM0414 and RR_K2 cruises including measurements of pressure, temperature, salinity, dissolved oxygen and fluorescence. See Processing Methodology for VERTIGO documents for further information.
Suggested CitationDataset: Siegel, David A., "VERTIGO project Niskin bottle sample data from KM0414 and RR_K2 cruises", 2010-12-10, DOI:10.1575/1912/4199, https://hdl.handle.net/1912/4199
The following license files are associated with this item:
Showing items related by title, author, creator and subject.
Calibrated CTD measurements of salinity and oxygen and Niskin bottle water samples collected from the R/V Ka'imikai-o-Kanaloa KOK1108 cruise from June 5 to June 16, 2011 (Fukushima Radionuclide Levels project) Jayne, Steven R.; Buesseler, Ken O. (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: email@example.com, 2012-07-12)This Establishing Radionuclide Levels in the Atlantic and Pacific Oceans Originating from the Fukushima Daiichi Nuclear Power Facility (Fukushima Radionuclide Levels) Niskin bottle samples dataset includes the following ...
Total organic sulfur (TOS) collected from Niskin bottle samples on R/V Knorr cruise KN210-04 in the Western Atlantic Ocean between Uruguay and Barbados from March to May 2013 (Deep Atlantic DOM project) Kujawinski, Elizabeth; Longnecker, Krista (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: firstname.lastname@example.org, 2019-03-15)This dataset contains the concentration of total organic sulfur (TOS) in seawater from samples collected during the R/V Knorr cruise KN210-04 between 29 Mar 2013 and 06 May 2013 along the eastern coast of South America. ...
Niskin bottle water samples and CTD measurements from the Hawaii Ocean Time-Series cruises from 1988-2016 (HOT project) Karl, David M. (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: email@example.com, 2019-07-15)Monthly measurements of the thermohaline structure, water column chemistry, and primary production were collected at station ALOHA as part of the HOT program. For a complete list of measurements, refer to the full dataset ...