Emails, Derek “Deke” Arndt, chief, Monitoring Branch, NOAA National Centers for Environmental Information, June 20, 2018

From: Derek Arndt - NOAA Federal

Sent: Wednesday, June 20, 2018 2:51 PM

Hi Mr. Selby,

My name is Deke Arndt from NOAA's National Centers for Environmental Information. I received a question through our public affairs professionals.

We base our reports and analysis on the NOAA dataset curated here in Asheville. According to the dataset, we've had 401 consecutive months that were, at least nominally, warmer than the 20th century average.

Thanks

Deke

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Derek "Deke" Arndt

Chief, Monitoring Branch

NOAA National Centers for Environmental Information (NCEI)

On Wed, Jun 20, 2018 at 3:52 PM, Selby, Gardner (CMG-Austin) wrote:

How would you explain why other researchers – in England and at Berkeley Earth – landed up with fewer straight months of record-high temperatures? What’s the methodological contrast?

From: Derek Arndt - NOAA Federal Sent: Wednesday, June 20, 2018 2:54 PM

I believe they are referring to different datasets.

Thanks

Deke

On Wed, Jun 20, 2018 at 3:54 PM, Selby, Gardner (CMG-Austin) wrote:

Of course; how would you briefly describe the distinctions?

Sent: Wednesday, June 20, 2018 2:56 PM

In the datasets or in how they define streaks? I'm not sure I'm following you here.

Deke

On Wed, Jun 20, 2018 at 4:35 PM, Selby, Gardner (CMG-Austin) wrote:

Both.

3:49 p.m.

I don't know how they define streaks.

We use the NOAAGlobalTemp in our reports. Its basic construction is laid out here, and in the peer-reviewed articles referenced therein. I can't speak authoritatively to the other datasets, as we do not incorporate them in our monthly analyses.