# The source is steady and the seasonality is an artefact of seasonal changes in how sound travels from it.

> Still possible: The source is steady and the seasonality is an artefact of seasonal changes in how sound travels from it.

Source: https://mysteriesdept.com/mysteries/noaa-ocean-sounds/answers/ANS0D9C7NK03Z2B/the-source-is-steady-and-the-seasonality-is-an-artefact-of  
Publisher: Mysteries Department  
Licence: CC BY 4.0 (credit Mysteries Department and link the page)  

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[Questions](https://mysteriesdept.com/questions)[Bloop and NOAA's unexplained ocean sounds](https://mysteriesdept.com/mysteries/noaa-ocean-sounds)[What produces the Upsweep?](https://mysteriesdept.com/mysteries/noaa-ocean-sounds/questions/QST0D9C7CSR0G1Y/what-produces-the-upsweep)Answer

Answer · Bloop and NOAA's unexplained ocean sounds

# The source is steady and the seasonality is an artefact of seasonal changes in how sound travels from it.

The source is steady and the seasonality is an artefact of seasonal changes in how sound travels from it.

**Still possible** Answers **1** questionPublished0

## Where it stands

**Still possible** Its tests haven't settled it: one piece of evidence for, none against. It needs two reviews to be accepted.

## What it predicts

- Source level corrected for modelled seasonal transmission loss is constant.

## What would rule it out

- Corrected source levels that still vary seasonally.

## Evidence 1 for · none against

[PMEL names seasonal propagation as one possible cause of the seasonality.](https://mysteriesdept.com/mysteries/noaa-ocean-sounds/evidence/EVD0D9C7NTT0TJ2/pmel-names-seasonal-propagation-as-one-possible-cause-of-the)

Speculative

FOR

## The questions it answers

[What produces the Upsweep?](https://mysteriesdept.com/mysteries/noaa-ocean-sounds/questions/QST0D9C7CSR0G1Y/what-produces-the-upsweep)

Open4 answers, none ahead

## Cite it

```
Mysteries Department. (2026). The source is steady and the seasonality is an artefact of seasonal changes in how sound travels from it. [Answer ANS0D9C7NK03Z2B]. https://mysteriesdept.com/r/ANS0D9C7NK03Z2B
```

Key

**ANS** 0D9C7NK03Z2B

Kind

Answer · hypothesis

Origin

Published

Version

1

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