(Updates prices) MELBOURNE, March 15 (Reuters) - London aluminum hovered near its lowest since late December on Thursday on expectations of rising supply as China's winter pollution controls expire. More generally, metal prices came under light pressure amid mounting investor concerns that growing trade tensions would hurt the global economy.
* LONDON ALUMINIUM: London Metal Exchange aluminum was trading flat at $2,089 a tonne by 0728 GMT, having slipped to its weakest since Dec. 19 at $2,087 on Wednesday. Support is seen at the 200-day moving average at $2,083, a break of which could trigger a steeper correction, as it would send a sell signal to momentum following funds.
* SHANGHAI ALUMINIUM: Shanghai aluminum hit its lowest in 14 months at 13,820 yuan ($2,191) on Tuesday and last traded at 13,990 yuan.
* HEATING SEASON ENDS: China's winter heating season ended on Thursday. Aluminum smelters in 28 northern Chinese cities had been told to reduce output by at least 30 percent from Nov. 15 to March 15, although the actual volume cut was below expectations, putting pressure on prices.
* OUTPUT: China's aluminum production fell 1.8 percent in January-February from a year earlier, as the country's pollution crackdown and supply-side reform kicked in. An estimated 4.4 million tonnes of new capacity are expected to be completed this year. "Although the (Chinese) figures show that aluminum production decreased year-on-year ... it reached over 90,000 tons on a daily basis the highest level since last June," said Commerzbank. "Stocks of both steel and aluminum have grown noticeably so far this year, which points to subdued demand and could give rise to concerns about excessive supply."
* STOCKS: ShFE aluminum <AL-STX-SGH> stockpiles held at exchange warehouses are within a whisker of record highs near 850,000 tonnes, reflecting a surplus of domestic material.
* DISCOUNT: The discount between cash ShFE aluminum and physical prices <AL-A00-CCNMM> has narrowed to 35 yuan from 385 three weeks ago, reflecting a tightening market and an expected pick-up in nearby demand.
* COPPER: LME copper slipped 0.4 percent to $6,960 a tonne, paring previous session's gains. Prices are expected to rise as industrial production in the seasonally strongest second quarter ramps up.
* TRADE: The Trump administration is pressing China to cut its trade surplus with the United States by $100 billion.
* COBALT: Glencore, the world's biggest producer of cobalt, has agreed to sell around a third of its cobalt production over the next three years to Chinese battery recycler GEM.
* SMOG: Eastern China's Jiangsu province will step up its war on pollution and focus on "high-quality development" following a spike in smog early this year.
* DOLLAR: Supporting metals, the dollar fell against the yen on Thursday as lingering worries about global trade tensions weighed on investors' risk appetite.
BASE METALS PRICES 0737 GMT Three month LME copper 6965.5 Most active ShFE copper 52110 Three month LME aluminum 2089.5 Most active ShFE aluminum 13990 Three month LME zinc 3223 Most active ShFE zinc 24860 Three month LME lead 2398.5 Most active ShFE lead 18460 Three month LME nickel 13725 Most active ShFE nickel 103800 Three month LME tin 21185 Most active ShFE tin 144810
BASE METALS ARBITRAGE
LME/SHFE COPPER LMESHFCUc3 933.29 LME/SHFE ALUMINIUM LMESHFALc3 -1335.3 LME/SHFE ZINC LMESHFZNc3 698.72 LME/SHFE LEAD LMESHFPBc3 50.99 LME/SHFE NICKEL LMESHFNIc3 1387.37
(Reporting by Melanie Burton; editing by Richard Pullin and Vyas Mohan)