1 Indicator category

[Fill by hand, needs decision by Council]

2 Indicator name

Bottom Temperature - in situ

Includes variable(s): bottom temp anomaly in situ, reference bt in situ (1981-2010), reference sst in situ (1981-2010), sst anomaly in situ

3 Indicator brief description

The data presented here are time series of regional average bottom temperature anomalies from ship-based measurements made on the Northeast Continental Shelf.

4 Indicator visualization

No response

5 Indicator documentation

5.1 Are indicators available for others to use (data downloadable)?

## Yes

5.1.1 Where can indicators be found?

## Data: https://noaa-edab.github.io/ecodata/index.html 
## Description:  https://noaa-edab.github.io/catalog/bottom_temp_insitu.html 
## Technical documentation:  https://noaa-edab.github.io/tech-doc/bottom_temp_insitu.html

5.1.2 How often are they updated? Are future updates likely?

[need sequential look at datasets for update frequency. Future requires judgement]

5.1.3 Who is the contact?

5.2 Gather indicator statistics

5.2.1 Units

## degreesC

5.2.2 Length of time series, start and end date, periodicity

General overview: Annual

Indicator specifics:

Indicator

EPU

StartYear

EndYear

NumYears

MissingYears

bottom temp anomaly in situ

GB

1977

2023

46

1

bottom temp anomaly in situ

GOM

1977

2023

43

4

bottom temp anomaly in situ

MAB

1977

2023

43

4

bottom temp anomaly in situ

SS

1977

2023

41

6

reference bt in situ (1981-2010)

GB

1977

2023

46

1

reference bt in situ (1981-2010)

GOM

1977

2023

43

4

reference bt in situ (1981-2010)

MAB

1977

2023

43

4

reference bt in situ (1981-2010)

SS

1977

2023

41

6

reference sst in situ (1981-2010)

GB

1977

2023

46

1

reference sst in situ (1981-2010)

GOM

1977

2023

43

4

reference sst in situ (1981-2010)

MAB

1977

2023

43

4

reference sst in situ (1981-2010)

SS

1977

2023

43

4

sst anomaly in situ

GB

1977

2023

46

1

sst anomaly in situ

GOM

1977

2023

43

4

sst anomaly in situ

MAB

1977

2023

43

4

sst anomaly in situ

SS

1977

2023

43

4

5.2.3 Spatial location, scale and extent

General overview: by EPU

Indicator specifics:

Indicator

EPU

bottom temp anomaly in situ

GB

bottom temp anomaly in situ

GOM

bottom temp anomaly in situ

MAB

bottom temp anomaly in situ

SS

reference bt in situ (1981-2010)

GB

reference bt in situ (1981-2010)

GOM

reference bt in situ (1981-2010)

MAB

reference bt in situ (1981-2010)

SS

reference sst in situ (1981-2010)

GB

reference sst in situ (1981-2010)

GOM

reference sst in situ (1981-2010)

MAB

reference sst in situ (1981-2010)

SS

sst anomaly in situ

GB

sst anomaly in situ

GOM

sst anomaly in situ

MAB

sst anomaly in situ

SS

5.2.4 Management scale: all species, FMP level, species level, can it be aggregated or separated to different scales?

[Classify by hand, note gridded data if available could be applied to different species ranges]

5.2.5 Uncertainty metrics

5.3 Are methods clearly documented to obtain source data and calculate indicators?

## Yes

5.3.1 Can the indicator be calculated from current documentation?

[Build link to Tech-doc, look for current and previous methods]

5.3.2 Is code publicly available? up to date?

[Build link to Tech-doc, look for current and previous methods]

5.3.3 Have methods changed over time?

[Build link to Tech-doc, look for current and previous methods]

5.4 Are indicator underlying source data linked or easy to find?

[Build link to Tech-doc, look for source, may require judgements]

5.4.1 Where are source data stored?

[Build link to Tech-doc, look for source, may require judgement]

5.4.2 How/by whom are source data updated? Are future updates likely?

[Build link to Tech-doc, look for source, may require judgement]

5.4.3 How often are they updated?

[Build link to Tech-doc, look for source, may require judgement]

6 Indicator analysis/testing or history of use

6.1 What decision or advice processes are the indicators currently used in?

The bottom temperature index incorporates near-bottom temperature measurements collected on Northeast Fisheries Science Center (NEFSC) surveys between 1977-present. Early measurements were made using surface bucket samples, mechanical bathythermographs and expendable bathythermograph probes, but by 1991 the CTD – an acronym for conductivity temperature and depth – became standard equipment on all NEFSC surveys. Near-bottom refers to the deepest observation at each station that falls within 10 m of the reported water depth. Observations encompass the entire continental shelf area extending from Cape Hatteras, NC to Nova Scotia, Canada, inclusive of the Gulf of Maine and Georges Bank.

6.2 What implications of the indicators are currently listed?

No response

6.3 Do target, limit, or threshold values already exist for the indicator?

[Fill by hand; if not in key results or implications, likely does not exist]

6.4 Have the indicators been tested to ensure they respond proportionally to a change in the underlying process?

[Fill by hand; if not in introduction, key results, or implications, likely not tested]

6.5 Are the indicators sensitive to a small change in the process, or what is the threshold of change that is detectable?

[Fill by hand; if not in introduction, key results, or implications, likely not tested]

6.6 Is there a time lag between the process change and the indicator change? How long?

[Fill by hand; if not in introduction, key results, or implications, likely not tested]

7 Comments

[Fill below by hand once above data complete]

7.2 What additional work would be needed for the Council to use the indicator?

7.3 What issues are caused if there is a gap or delay in data underlying the indicator