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      <gmd:descriptiveKeywords>
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          <gmd:keyword>
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Detailed abstract: We characterized the pH environment currently experienced by Euphausia pacifica eggs and larvae at 2 stations in the northern end of Hood Canal in Puget Sound, Washington, USA (47.61Â° N, 122.94Â°W and 47.66Â° N, 122.86Â°W; Puget Sound Regional Synthesis Model [PRISM] stations P14 and P15). The southwest station, P14, is deeper (180 m) than the northeastern station, P15 (130 m). Samples were collected during the day and night on 9â10 April and 15â16 June 2012. This design was chosen to sample during the spawning season of E. pacifica (approximately February to July) in an area where low pH waters occur (Feely et al. 2010). We collected physical and chemical data using a CTD profiler equipped with a pH sensor (SBE-18, Sea-Bird Electronics) and Niskin bottles, which were used to collect water at 6 depths for spectrophotometric pH, total dissolved inorganic carbon (DIC), and total alkalinity (TA) analyses. The CTDâs pH sensor was not accurate, so it was only used to determine the shape of the pH profile relative to discrete measurements. Spectro photometric pH was measured shipboard immediately after water sampling (Ocean Optics USB 2000+ Fiber Optic Spectrometer; m-cresol purple dye from Sigma Aldrich). TA was measured by open-cell potentiometric titration (according to SOP 3b in Dickson et al. 2007), and DIC was measured by acidification and quantification either using a Licor-700 CO2 detector at the University of Washingtonâs Friday Harbor Laboratory, or a CO2 coulo meter (UIC model CM5015) at the University of Washingtonâs School of Oceanography. All chemistry samples from the field and experiments were analyzed according to Dickson et al. (2007) and Riebesell et al. (2010). We calculated full carbonate system parameters using CO2sys version 2.1 (Lewis &amp; Wallace 2012) with K1 and K2 constants from Lueker et al. (2000), KHSO4 constant from Dickson (1990), [B]T from UppstrÃ¶m (1974), and the total pH scale.</gco:CharacterString>
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An optical spectrometer (spectrophotometer, spectrograph or spectroscope) is an instrument used to measure properties of light over a specific portion of the electromagnetic spectrum, typically used in spectroscopic analysis to identify materials.

Butler, L. R. P.; Laqua, K. (1995). "Nomenclature, symbols, units and their usage in spectrochemical analysis-IX. Instrumentation for the spectral dispersion and isolation of optical radiation (IUPAC Recommendations 1995)". Pure Appl. Chem. IUPAC. 67 (10): 1725â1744. doi:10.1351/pac199567101725. A spectrometer is the general term for describing a combination of spectral apparatus with one or more detectors to measure the intensity of one or more spectral bands."</gco:CharacterString>
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