In Situ Calibration of the SeaBird 9plus CTD Thermometer

Uchida, Hiroshi; Ohyama, Kentaro; Ozawa, Shogo; Fukasawa, Masao

doi:10.1175/jtech2093.1

Cited by 19 publications

(12 citation statements)

References 1 publication

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“…We conducted revisit observations of P10 in 2005 and P3 in 2005–2006 by from the R/V Mirai (Figure 1). Accuracy of temperature measurements was estimated to be about 0.001°C [ Uchida et al , 2007], and that of salinity was 0.001. Section P2 was revisited by the R/V Melville in 2004.…”

Section: Methods and Data Setsmentioning

confidence: 99%

Changes of North Pacific Intermediate Water properties in the subtropical gyre

Kouketsu

Kaneko

Kawano

et al. 2007

Geophysical Research Letters

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A comparison of trans‐Pacific hydrographic observations revealed changes in properties of North Pacific Intermediate Water (NPIW) in the subtropical gyre of the North Pacific from 1980s and 1990s to 2000s. Salinities decreased on density surfaces above the NPIW salinity minimum and increased below the salinity minimum. The potential temperature of the NPIW core increased by 0.10 – 0.17°C, although the salinity of NPIW core did not change substantially. The pattern of salinity changes on neutral surfaces was consistent with a density decrease of the NPIW core. It is suggested that the property changes of the NPIW core can be explained by NPIW warming.

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Section: Methods and Data Setsmentioning

confidence: 99%

Changes of North Pacific Intermediate Water properties in the subtropical gyre

Kouketsu

Kaneko

Kawano

et al. 2007

Geophysical Research Letters

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“…The electrical reference thermometer SBE35, which is a more precise reference thermometer (SBE 35) than available before, has been used since 1996 for in-situ comparisons against the sensors. Such comparisons serve essentially as one point calibration checks and cannot replace laboratory calibrations but they are useful to detect possible pressure effects on the thermometer in the mK-range (compare [14]. A small pressure dependence of one of the routinely used temperature sensors (S/N 1338) of about 1 mK/4000 dbar could only be identified with the advent of this reference.…”

Section: Datamentioning

confidence: 99%

An Integral View of the Hydrographic Development in the Greenland Sea Over a Decade

Budéus¹,

Ronski²

2009

TOOCEAJ

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A thirteen year long time series (1993 to 2005) of basin wide transects is used to analyse the hydrographic development in the Greenland Sea and to identify the processes which are responsible for observed changes. A key feature is the structural change away from a cold water dome to a two layer structure which is related to a fresh water convergence around 1990. The ensuing changes in the upper layer, the interface, and the lower layer are discussed in detail. The upper layer increases continuously in volume and shows no unequivocal trend in any hydrographic property. All observed modifications are reversible. The interface descends steadily with time by more than 1000 m during the investigation and shows constant properties. At the end of the time series, the deep layer volume is reduced to only 50% due to the interface descent. Both temperature and salinity show unambiguous trends in this layer. The temperature increase is mainly caused by vertical advection, the salinity increase by exchange with deep Arctic waters. The observations corroborate the idea that a large single-cell continuous convection scheme dominates the volume changes of both upper and lower layer and the deep water modifications during the 90s. These changes are independent of winter convection. The export from the deep layer is concentrated at the western continental slope of the basin.

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“…The accuracy of the pressure data was estimated to be within 2 dbar based on calibration results from the dead‐weight piston gauge against laboratory reference standards for effective area, pressure, and mass, traceable to the National Institute of Standards & Technology, USA. The CTD data were corrected using the in situ reference temperature [ Uchida et al , 2007]. Both accuracy and precision of the CTD data were evaluated as 0.0004°C.…”

Section: Hydrographic Observationsmentioning

confidence: 99%

Flow of abyssal water into Wake Island Passage: Properties and transports from hydrographic surveys

et al. 2007

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. Close linear relationships between potential temperature (q) and salinity, dissolved oxygen, and silicate were seen below q % 1.1°C (%4000 m). The relationships above q % 1.1°C were scattered and were separated into relatively salty, oxygen-rich, silicate-poor water to the south, and water with the opposite properties to the north. The results suggested that there was a boundary between water masses at q % 1.1°C in the deep passage. In addition to the three hydrographic sections, two hydrographic sections previously surveyed in the deep passage in 1975 and 1999 were reexamined for transport estimates. Geostrophic calculations relative to the q = 1.1°C surface indicated northward transports of the abyssal water from 0.5 to 2.2 Sv (1 Sv = 10 6 m 3 s À1 ) below this surface. When 1-year mean estimated velocities at q = 1.1°C surface were used for reference, mean transport from the five estimates increased from 1.4 to about 4 Sv. The temperature of abyssal water colder than 1.1°C was found to have increased by an average of 0.012°C between 1975 and 2005. This warming is greater than double the standard deviation from the temporal mean temperature profile obtained from mooring observations.

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In Situ Calibration of the SeaBird 9plus CTD Thermometer

Cited by 19 publications

References 1 publication

Changes of North Pacific Intermediate Water properties in the subtropical gyre

Changes of North Pacific Intermediate Water properties in the subtropical gyre

An Integral View of the Hydrographic Development in the Greenland Sea Over a Decade

Flow of abyssal water into Wake Island Passage: Properties and transports from hydrographic surveys

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