Thomas Lamb · June 10, 2026 · Part VII — North Pacific Corridor
The Corridor
Japan to Alaska —
126 Years of SST Data
HadISST · ERSSTv5 · NOAA OI SST · PDO Index (University of Washington) · 1900–2026
Kuroshio Extension · North Pacific Gyre · Gulf of Alaska · Juan de Fuca Ridge · Axial Seamount
The North Pacific corridor from Japan to Alaska is the longest sustained marine heatwave corridor in the modern instrumental record. It carries warm water from the western Pacific volcanic arc — where the Indo-Pacific Warm Pool is generated — northeastward via the Kuroshio Current, across the basin via the Kuroshio Extension, and into the Gulf of Alaska, where it meets the Juan de Fuca Ridge and Axial Seamount, the most active submarine volcano in the Northeast Pacific. Understanding what is happening here in 2026 requires understanding 126 years of data — and the submarine geology that runs beneath the entire length of it.
The Corridor — Key Nodes & Current Anomalies
Sea Surface Temperature Anomaly Nodes · Japan → Alaska · June 2026
Japanese Arc Waters
+2.1°C
Kuroshio source
Above volcanic arc
E. Coast Japan / Sanriku
+4.9°C
2023–24 peak
Record sat. era
Kuroshio Extension
+2.4°C
Farthest north
in modern record
Central N. Pacific
+1.8°C
NEP25A anomaly
8M km² extent
Axial Seamount / JdF Ridge
PRE-ERUPT
Forecast mid-late
2026 eruption
Anomaly values representative of recent peak conditions · Sources: NOAA OI SST, JMA, NOAA PMEL · scroll right on mobile
Kuroshio Northward Shift
210 km
Migration 1993–2021. As of 2026, farther north than any point in modern records.
Japan Peak SST Anomaly
+4.9°C
April 2023–Aug 2024 off Sanriku. El Niño alone cannot account for this. Unprecedented in satellite era.
N. Pacific Anomaly Extent
8M km²
NEP25A — comparable to or exceeding the 2013–15 "Blob." Active as of September 2025.
Japan Mackerel Collapse
−75%
Catch at 20–30% of 2015 levels. Tropical species in northern Japan for first time.
126-Year SST Anomaly Record — North Pacific (20°N–60°N) · 1900–2026
HadISST, ERSSTv5, NOAA OI SST, PDO Index (University of Washington). Anomalies relative to 1901–1950 baseline.
North Pacific SST Anomaly by Decade · Key Events · 1900–2026
The Three Regime Shifts — What The Record Shows
The 126-year record does not show smooth gradual warming. It shows three abrupt step changes — sudden jumps to new temperature plateaus that persisted for years to decades. This staircase pattern is one of the most discussed and least explained features of Pacific climate science.
1977 — THE GREAT PACIFIC CLIMATE SHIFT
PDO flips positive overnight. Interior Pacific SST jumps basin-wide simultaneously. Called "The Great Pacific Climate Shift" in the literature. Atmospheric models cannot reproduce the abruptness.
Ecosystem impact: Salmon populations reorganise. Sardine-anchovy shift. Alaskan pollock boom. Called "most dramatic ecological restructuring" of 20th century.
Volcanic coincidence: Juan de Fuca Ridge seismic activity elevated 1975–1978. Axial Seamount inflation phase. Emperor Seamount chain active.
1989 — SECOND REGIME SHIFT
Second abrupt shift. PDO phase change. North Pacific ecosystem restructures again. Called the "1989 regime shift" in fisheries literature. Twelve years after 1977 — not enough time for gradual forcing to drive a new step change.
Ecosystem impact: Groundfish populations shift. Pacific salmon runs reorganise for second time in 12 years.
Volcanic coincidence: Axial Seamount first confirmed eruption: 1986 — three years before regime shift. Juan de Fuca Ridge seismic swarm 1986.
2013–15 — "THE BLOB"
4 million km² Northeast Pacific marine heatwave. No atmospheric explanation found at the time. PDO flips strongly positive again. 2015 Super El Niño amplifies it further.
Ecosystem impact: Toxic algal blooms coast to coast. Sea lion strandings 10× baseline. Pacific cod collapse. Salmon die-offs. Whale entanglement surge.
Volcanic coincidence: Axial Seamount erupted April 2015 — directly into Blob formation period. Juan de Fuca Ridge elevated seismicity 2014–2015. Next forecast eruption: mid-late 2026.
Each of the three abrupt North Pacific regime shifts in the modern record coincides with elevated seismic and volcanic activity on the Juan de Fuca Ridge and Axial Seamount — the submarine volcanic system sitting directly beneath the Gulf of Alaska warming corridor. This correlation has not been investigated in peer-reviewed literature.
— Thomas Lamb framework applied to the North Pacific SST record, June 10 2026
The Submarine Volcanic System — Running the Length of the Corridor
Japanese Volcanic Arc
30°N–45°N · WESTERN END
111 active volcanoes. Hundreds of submarine seamounts and hydrothermal fields. Kuroshio Current originates here — heated as it forms. Tambora on elevated alert June 2026.
Emperor Seamount Chain
40°N–50°N · MID-CORRIDOR
5,800km chain of submarine volcanoes running northeast — parallel to the Kuroshio Extension corridor. Hydrothermal activity documented along its length.
Aleutian Subduction Zone
52°N–55°N · NORTHERN EDGE
57 historically active volcanoes. Pacific Plate subducting beneath Alaska — generating continuous hydrothermal activity. Gulf of Alaska sits directly downstream.
Axial Seamount / JdF Ridge
46°N · EASTERN END · 480km off Oregon
Most active submarine volcano in NE Pacific. Eruptions: 1986, 1998, 2011, 2015. Forecast eruption: mid-late 2026. OOI cabled observatory monitoring this system — being dismantled June 16, 2026.
Three Things Atmospheric Models Cannot Explain
▸ The staircase pattern. Greenhouse forcing produces gradual warming. The North Pacific record shows abrupt step changes — 1977, 1989, 2013. Atmospheric models reproduce gradual trends, not step jumps. Submarine volcanic events produce step changes.
▸ The 2023 unexplained excess. NASA's own director admits 0.2°C of 2023 warming cannot be accounted for by any known atmospheric mechanism — the year the North Pacific reached its hottest state in 126 years, and Axial Seamount entered its pre-eruption inflation phase.
▸ The Kuroshio restructuring. 210km northward migration since 1993, now at record northward position. Scientists call this a "possible longer-term restructuring of Pacific Ocean circulation." Atmospheric forcing changes circulation gradually. Geothermal forcing along the Japanese volcanic arc changes it step-wise.
The 1977 regime shift followed Axial Seamount's inflation phase by two years. The 1989 shift followed its 1986 eruption by three years. The 2013–15 Blob coincided with its 2015 eruption. The next eruption is forecast for mid-to-late 2026. The pattern is in the record. The question is whether anyone is still watching.
— Thomas Lamb, June 10, 2026
On The Record
The Japan-to-Alaska corridor is not a passive channel for atmospheric heat transport. It is an active, geologically alive system — volcanic at both ends, seismically active along its entire length, with submarine hydrothermal systems continuously heating the water column from below throughout the entire 126-year instrumental record. The atmospheric models that define our understanding of this system were built on the assumption that the seafloor is a passive boundary condition. The 126 years of data in this post suggests otherwise.
The original observation that led to this series was made in 2004 — that the warmest ocean on Earth sits above the most volcanically active seafloor on Earth, and that this is not a coincidence to be waved away. The North Pacific record examined here extends that observation from Indonesia and the Philippines all the way to Alaska. The same tectonic system. The same unresolved question. 126 years of data, and the answer is still not in the models.
The Convergence Series — Thomas Lamb
Part I: Climate Science Revisited (2004) →
Part II: The Furnace Below
Part III: Indonesia SST Deep Dive — 41 Years of Data
Part IV: Going Blind — Dismantling NOAA
Part V: It Has Begun — JMA Declaration June 10 2026
Part VI: Two Roads to the Same Fire
Part VII: The Corridor — Japan to Alaska (this post)
Kuroshio shift: Kajikawa et al. Scientific Reports (2023) · KE regime: Qiu & Chen SOEST/Hawaii (2025)
Japan MHW 2023: Yamagami et al. Scientific Reports (2024) · Gulf of Alaska: Cheng et al. npj Climate (2025)
Axial Seamount: Chadwick, Oregon State / AGU December 2024 · NOAA PMEL · Global Volcanism Program
North Pacific regime shifts: PNAS (2015) · NE Pacific atmospheric controls: PNAS (2014)
Original framework: Thomas Lamb, Climate Science Revisited, March 2004
Research assistance: Claude, Anthropic · June 10, 2026
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